Malicious PDF — malware analysis report

Static analysis result for SHA-256 5547bde060c10ce1…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 14:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d5430992968b98a20dc3b51e94fdae5 SHA-1: f9ab7b4ebd8c0377eb5519d0700b02898924ea93 SHA-256: 5547bde060c10ce105ab4b1c1392bf0b9b5acfc1844098cdb266fa3487383f75
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of ClamAV detection and ML classifier flagging further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to potentially harmful sites.

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 https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/rq8pa1qh2n679k33lojaq792n5/lugipepuladevaniv.pdf In PDF document text
    • http://cmuniontravel.com/userfiles/files/gizefegenefobuve.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/33658431587.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c05383ae0c3---fekexoxefawidobikimajata.pdfIn PDF document text
    • http://farashimirooz.com/files/mafoxagako.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612d71e0e0336---zasoluxilakikuvimurufabuv.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/8412915455.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5e3e281770ae862c6e95344cf03990d5/fabudetirarar.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e70746ea0f6---madepesefisodoxo.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/63616546762.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9a1426a3caf677e7d3841ca253264f0e/zubovuxuvevewudowa.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/77c7ad7249a15b341ff8a125049bb6d5/tofevamewunivag.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2eb829a9b---tunozenegutarediro.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d46a2f79f---2976963375.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd67878580---74228100739.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/xigajiramuzeni.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c34f86adec6a77509424f1d5daa037c6/96469033762.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/82314948796.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d666uvhklkv0ifjumv0m6bob70/xobel.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5da31a2b---80919387329.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8dfc95717---19125788247.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/5797337586.pdfIn PDF document text
    • https://mmszke.hu/files/file/pirorujifira.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/28293961784.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lijotikafuvifovuxabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vtech+alphabet+train+manualPDF 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_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 19832 bytes
SHA-256: 7162d3327f82a356775ef60501a6543630344c7e6440ebc35600e1826a9d703e
font_01_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D10 10560 bytes
SHA-256: e9bda74f716f292052fb362b408e74d0e5e4b83bf332ad1a0ae33056ff809fac

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