Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fab6e02ce6e13e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 14:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce4e619eb77a1c38288fad467d96edcf SHA-1: 6d7d01f85df42f67aaa6dd77be0118c7dde0ad50 SHA-256: 13fab6e02ce6e13e4996c3af7bd8b3eb2b26d96b5d20a40c8bdb6d892d050ae4
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various domains, some of which appear to be compromised or disposable hosting. The presence of these links suggests an attempt to direct users to malicious content, consistent with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.elmundodelapiscina.com/ckfinder/userfiles/files/fuguzawedipi.pdf In PDF document text
    • http://vektor-bezpeki.com/userfiles/files/zelotubabolulufogixer.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133faa959d0b---piwobuxefigo.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/12428363087.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161421e3d26895---66056379766.pdfIn PDF document text
    • http://anpharma.net/upload/files/76804307507.pdfIn PDF document text
    • http://varvshistoriska.com/file/82751570368.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/25248406597.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c2caf328ec9159e25830184a27487c0b/96056310594.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/73300715495.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/46413749847.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/nagamatirozedosidufanami.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/34739066121.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/51607441517.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/44585119818.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210906224533.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gimavokoxe.pdfIn PDF document text
    • https://kueapem.com/contents/files/miseredudexesofirebiku.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/19012993687.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34608872476.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/wadixugorufugekokagusuriz.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/59168108126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rayman+origins+apkPDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 10572 bytes
SHA-256: f886adca761e1b794addb40cf5a4b907a4b7fe834e8222f6eec8e7c9c044a43c
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 18800 bytes
SHA-256: 46fe356ba5b541818e789709682bc2005fb7dcd256837bb20a8ca36da55cbbe4
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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