Malicious PDF — malware analysis report

Static analysis result for SHA-256 818157b34e470565…

MALICIOUS

PDF

90.5 KB Created: 2021-09-16 03:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dfe5cc8947697ee7ca509af26affd5c SHA-1: 06c944e9acee7740a047899631159457a12c3e4f SHA-256: 818157b34e4705653ed5c9169051aed7f43bcb3e2f4704e30a7b09fdffc11db5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to potentially compromised or disposable hosting. The presence of numerous links, including one to a compromised WordPress upload, suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://squarcialupirelaxinchianti.com/writable/public/userfiles/file/mokopize.pdf In PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/16970016777.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109082108239585.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/3064134155.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dalipulujenepafo.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/detipa.pdfIn PDF document text
    • http://strandedtattoo.net/file/15641080151.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161417d127c45a---29112321752.pdfIn PDF document text
    • http://uchid.com/uploads/file/fasomexifurifego.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/90333249007.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1d5d977e---nugabokisadamuwefugu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/61769492818.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/lumaxerowixarifij.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/noruxikanitukege.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/pevetiki.pdfIn PDF document text
    • http://kd-council.com/upfile/files/51393974958.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1143944872614202f4e8668.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/kepepageximin.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/xotowebugurifinisefut.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4d1afb5c---44061088274.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/bufurogewaf.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/bebexiwag.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bepadamas.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/97334581857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=arcade+97+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 10528 bytes
SHA-256: 0d7ebdd258dd9f38791402d0fc1de328d19301bd032cf77d94b02c949c1cec30
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 22380 bytes
SHA-256: 6aefecf6cb1d379ec6718151d980031ea2d72863c1c39ef7162fd1afa8c60b06

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