Malicious PDF — malware analysis report

Static analysis result for SHA-256 7516adec4f499d37…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 14:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9219ad4d294ab147b561f611655450d7 SHA-1: 40c3397717f08f40aa7ac1c2e97570866654682e SHA-256: 7516adec4f499d377ad167b744016d582b023ad59c7d57fac13934de530b9cec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a link farm hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a phishing attempt designed to trick users into engaging with a malicious actor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gzafjc.com/uploadfile/files/pefiwawijop.pdf In PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/86954231803.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/75959377318.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/64312256276.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/betoxupofozaviwo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/14059778098.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/10947856797.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/zapepefukukisiki.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/zosuziz.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317ac776f09---nuvabubipewurisibarosowo.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/54425559112.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/94234044490.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/gapojejex.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d509447ee---pafisi.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/9328900084.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/799647361.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/bixukaxusano.pdfIn PDF document text
    • http://nessium.net/userfiles/file/wubixakativ.pdfIn PDF document text
    • http://eternaseguros.net/files/files/voworururezuri.pdfIn PDF document text
    • http://askaudit.ru/price/52177392949.pdfIn PDF document text
    • https://fishboat.hr/files/78707876586.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/62922900416.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109090515366775.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/munovuzagapivabej.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613297e4367de---77156013727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+save+contacts+from+android+phone+to+google+accountPDF 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_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 16804 bytes
SHA-256: b12d35fe44c259550feca1a83f972caea1eacda21c6cd48fbefaac8af4b67281
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 11312 bytes
SHA-256: d62c7595e239ed20d1230db219e54f25c68903b97e6da20c9ab4929b63e9e107

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