Malicious PDF — malware analysis report

Static analysis result for SHA-256 63212e8b92108830…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 09:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a61107ffe9eeb1a2d4e99b656f65c9ed SHA-1: 82477e7abdde2b63f93b2297411275e1b52bfefe SHA-256: 63212e8b921088301b0afd4078d21100c85af980d8d419a2f2bb70f2ac8cf036
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for callback phishing or tech-support scams. No scripts were extracted, but the presence of numerous external URIs suggests the document's primary purpose is to redirect the user to malicious content or initiate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=importance+of+b+negative+blood+group PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161579cf0bc425---7881587842.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/95384328039.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/tomexemekaxabuberum.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbdbd7e7fe---54850908342.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/netal.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/7620577833.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/49151746361.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/14913664215.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/71756797383.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42f58d8fa---13550965135.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca0d26b8c---83638494315.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/39411278009.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/81638802555.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/sizadupimaxevusizomu.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/rebobon.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/parak.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wekazijupofasizusetabuzor.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/gogowefaz.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/waledase.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/sewinejilujemejimuze.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/zexexiv.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/66555367235.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xajud.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/dikemogivowopiregorul.pdfIn PDF document text
    • http://novafish.it/userfiles/files/nodoliju.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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 11052 bytes
SHA-256: 0394a9fd12074eca29436b50de52d6c9b46a4237fad0792f5e31db7e30a18053
font_02_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 15588 bytes
SHA-256: 05851aac65f63a393a721f3e0fcaee1b22404b4e6d5599c2e8f8c5f6a3ef0d39

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