Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a883a73e2c0a76f…

MALICIOUS

PDF

84.5 KB Created: 2021-07-24 06:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5c81b7e99172617f58d03ba45929c69 SHA-1: 3f0183fdc3377db770491e2292eb70f1c3a283eb SHA-256: 6a883a73e2c0a76f18de9305054c88fff96be54ca1eeff4f8ca67c85c33cab9d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of multiple URLs hosted on various domains, some pointing to IP addresses or known compromised upload directories, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcadb7bdf5---6770365112.pdf In PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/7387723102.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/8go4m42k2dm94119bmrocaaqdk/bafuloso.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zilebedomeledu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/6379588927.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/38876932154.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1319a5e---79526756092.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/kuwewivumudarewaxeserivum.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/letusosaripedujidotofitap.pdfIn PDF document text
    • http://calisnt.com/uploads/files/pujenifemogi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b1bbc5b0a---fakivuludesor.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f927ea0df3d---5644732769.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/74369661223.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/21653740042.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd79f49716a---47744071816.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/87288460735.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160915988d32fb---toxigivaritofugizajewuped.pdfPDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/jev7e03e4p2sr7d11r8v3f7rr7/3419769841.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d9d562ec---89172939567.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/fozakaxulisimemorogupowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=planisferio+con+nombres+de+los+continentes+y+oceanos+para+imprimirPDF 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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 11036 bytes
SHA-256: 8dbb0a67281bd4d4583ce257b553ac95e695085ebeeb246bb718affb6507c953
font_02_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 17884 bytes
SHA-256: 02917639dc8b6387d2f8e91dc41be93c73540079af1cb2829eb80d6e2a028545

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