Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7794b1fff938a1…

MALICIOUS

PDF

109.3 KB Created: 2021-07-20 23:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f44ac37a067c472f6ae60d271c97273d SHA-1: 58fbb8f99c2f4bac566d587aed9fe9b1287569cb SHA-256: 9f7794b1fff938a1e4e46fa8a6cccfa0658b1ad8e115b26c6cf9a643bb2870b8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a payment redirection lure, attempting to trick users into providing new banking details or downloading a malicious file. Several URLs hosted on compromised WordPress sites and disposable domains were extracted, likely serving as the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bagumul.com/file_upload/spaw_upload/file/20210608024510.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893b180a029---xunanunetajelavupofaxat.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a396ce122a7---rowupixadasibiganolelizo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tapodixaje.pdfIn PDF document text
    • http://amdind.com/userfiles/file/ripokifewokome.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/v5ohl5v3jkl90bvctdvb2dh178/67674897096.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16085625023b1e---78332674436.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e67e79ec7---wibofakukebunoxazoxitumuj.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/fedisije.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/rimogelule.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795dd872bd5---20085868284.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pvamap40fk0ctellf9u3ojrf5s/77068298706.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/58867400394.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1ff216e4---lowafolobarulupenuv.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095945a9f4ba---55223196261.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d51c902bd---78908864877.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a253b79429---wopex.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaac8157c5---turajepa.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/vubewawelori.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/aca639f718e142b14f6ae9f98e6bccb8/41838901456.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/igpgs995c0k0fqo6u3fb982r3o/tamurelaz.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b2d9ff4b9468efd20411fa91a912d83e/lisezigub.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/nijon.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c48693eab2b2da6b4549ec7333cd9928/pegudorir.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8010d2c86e---97359996319.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912fc30ed92---74024150537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=asl+sign+for+brightPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFD 17380 bytes
SHA-256: cce03b808d9a633d17d49a530a07202bd3c7bc39e1d2a53023e2deb5f2187085
font_01_sfnt_off000178ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190C3 10320 bytes
SHA-256: 97c223cdb02c03a91af35ee977750662b14be9d2130a135be4970d3ae490323d

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