Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6e4654a8c8136f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 10:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4c974ae4c98cb136e0e02a881659fd6 SHA-1: 9e1dbffa981aca654da872a18790ce10cf930d06 SHA-256: 4a6e4654a8c8136f9b467b397c70b11822af9a26d2e1bfcdfc03e38b5a110a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=tribute+from+grandchildren+to+late+grandmother+pdf PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0v3r0nptln9crs8o9nk3tu27jj/sopatad.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca75a91ac---34076152392.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/8707098523.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060919430973499.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2tj6j09mo4sg4cpeemk2s54phn/61911547646.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/7c1d9d3d0ab6b2b1f1079b19bcc32b66/rafozigududosemib.pdfIn PDF document text
    • http://austarpharma.austarchina.com/upload/files/rakuruzejixoleposilo.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/xonuzageruj.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/53690246679.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc1607bf4---gesebubof.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7d61372jme44eqq98inqfnhks3/dopabuvelujo.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/vitas.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/10348551446.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/mexaribegijabifi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/setimotusoraguwamuno.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc57c61fef---93549667216.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/t3876ki4gvoblivm0v7lg0bqo1/zazaromenologuso.pdfIn PDF document text
    • http://precisao.org/files/files/ruvadizowozenapesif.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/99120734163.pdfIn PDF document text
    • http://one9five.com/userfiles/files/rerunewiritug.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/759c191e10ed0eb6d975bb681865369f/zarototazefogemi.pdfIn PDF document text
    • http://ledins.lv/cms/file/35705972391.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cd38cddd04fbdf0548a7ae9f1dded22/buzaxixizotexofur.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1e2043a36---70772848856.pdfIn PDF document text
    • 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_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 17644 bytes
SHA-256: 1a936e4b37128eea62e9a7f6b5590faa38bbcb68e9a40e019087d3e79d031587
font_01_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 11104 bytes
SHA-256: a8f5837f46a3016a52e94b3753f323fc5809c7c58063504d4095d4824c239f42
font_02_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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