Malicious PDF — malware analysis report

Static analysis result for SHA-256 85586ffbc501be7d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 12:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4681817de793be592fd5e0ff91eb6a9a SHA-1: 3af6a0d9e8c67b72dc45c6a0f6b355866827679e SHA-256: 85586ffbc501be7de4b304a56ce3a9a8d4a2daba65894c1f3e6114bd1146a334
184 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the intent to trick users into downloading a payload. No scripts were extracted, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=dream+league+soccer+2021+hack+ios+download PDF link annotation
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejozigesisukip.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e4fc7e6c3de22aad81a8cdb5a1b3e8aa/60469646552.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bojisiwivaneleme.pdfIn PDF document text
    • https://rajaunited.com/contents/files/pakenunesiw.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/82918230076.pdfIn PDF document text
    • http://ippon.lv/uploads/File/doselelamig.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/73916098600.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8e9a1cfd98490bef227502e796773d35/podunikivomafivorovosakut.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/zokaneganitafekalupeget.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109040758022748.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109081548573682.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613980cfa1ea1---24164404939.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/ditegagejolimimexifilivaz.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/liwabodur.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/pifetibumanumoxoje.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/58615420580.pdfIn PDF document text
    • https://znalac.com/userfiles/file/wosekideramefogafepu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sqh0acaltfje1bhjqspttvek3l/76389598814.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/12646270352.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/56976721202.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/27611805440.pdfIn PDF document text
    • https://ghnservizi.com/file/72363978038.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/18436286667.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/29672614658.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/65q0sh5qk4c6k5c60vvuu5vvd5/karixonupopezur.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd95e597af---85143939996.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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 17720 bytes
SHA-256: c8f665b00d4c9bbb34364cd637e6287e4c89d3e6d40e8b5bbf8486090e7f9901
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 11292 bytes
SHA-256: a3677f064abc3e54b493fdc2fc24163914ae03af43d3d191913ea6a2bf061a0a

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