Malicious PDF — malware analysis report

Static analysis result for SHA-256 8566410a8b7e898e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 08:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b842bd0ae2c6cda98cb03c405c2a148 SHA-1: 2390e2fe41505425bd4d72a8f9daaba768957247 SHA-256: 8566410a8b7e898ef375dd097bcec53d2b63458982f621454d3b97a125f7dd05
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and link farm attack. The document contains multiple embedded URLs pointing to compromised websites and disposable hosting, designed to lure users to potentially harmful content. The presence of a callback lure suggests a further attempt to engage the user through deceptive means, likely leading to credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://remobudostol.pl/pliki/rujupubuxitowufavilotu.pdf In PDF document text
    • http://generale-bureautique.fr/gdb/files/file/nugotuzabifikobexenomew.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fewigeti.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/befiromivikewiti.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/zojewe.pdfIn PDF document text
    • http://kme-kme.cz/files/file/sevewozujada.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4bf7b5f2d08e2b1b0029bdb4be4c2050/68718533126.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609785f08c4c9---wenenawasazagevedoz.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/59537242702.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/sulinipozizakasokozek.pdfIn PDF document text
    • http://jfe.hk/userfiles/pesilo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/18933a1b8a78b09f165f6569afe4d84c/96378502427.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed360023176---61063810909.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/nonin.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608776a5bbd88---vujur.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/14554911500.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/zetule.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/2373186690.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qc4msmihs1ruhlmomsdp5mmuvv/lolofobozatumud.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/93625518944.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/27530592258.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d5b4f170---81789135636.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/91310975197.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d852c4b0f---foranumelukeviwu.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/31474100098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=authorised+personnel+only+sign+pdfPDF 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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 10812 bytes
SHA-256: fb57e13d5333dcd2a86b81697ad237a52e3126b2b3089b345fe549d74126a276
font_02_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 18824 bytes
SHA-256: c1ab8dea934d5a36869f8e4cd7c4d4e0e1711377672f5f4cf55726b1e847a179

Open this report in the interactive analyzer, or submit your own file for analysis.