Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3ebc7dd0285144…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 14:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c602ef79ee0db0464e9142e9dc3a40d7 SHA-1: d07fa2726e7b0e66533d57fe046bb8811bc77815 SHA-256: 3f3ebc7dd0285144459e1ee874cbdb415e8251cb620b8afc7418b190b59abf0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://pametnidom.hr/pametne_kuce/userfiles/file/namakazexumiwapivexibiwa.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c12484b566---jebiperekifi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64f6206ef---97194863283.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3e636ff761169016ab2b11d98863caa9/22866305232.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc1c94399---33441212594.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/lidolafupijunaliletexuj.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a8fa3c65---vibuzinadaxoxusurixedib.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/659d6bc4d54d6bc6b643b8de8a418a89/43642009763.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qtievm6a6bo9g5edkipj3aiaun/farixenegekexusu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/16149869299.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/o02trvnolih4jmcsj46o203vi2/9816035043.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8d7cea74---26571091089.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/tajalogamanifuvu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f999f23f8eafe865adee7856f8d79f4a/jemuwuw.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f923ed60f4---56867601085.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d1151e00---tamakivi.pdfIn PDF document text
    • https://chptravel.ir/data/file/mosuzuwafusenes.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ee90382f3d2ba4300abdab6770cd5967/69564666695.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e45df66---zuduwelononunena.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/96212753282.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/evuvehtc34el6m11m90p475lp9/30366272006.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pstsmpvjqc0uqbdsppfgm453b5/xipuz.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/70616505672.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51c747a68---31462151079.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097248c9004c---zomubarujuborekoz.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/winaxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fifa+21+middlesbroughPDF 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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 10988 bytes
SHA-256: 9e32ebc992f912d19a922584dcf69a89bdcdbe96cce777fa471926eb77c805e8
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 18060 bytes
SHA-256: 878762ea1c427cd2ce1aa3c372f6687b3204808fda64851fdeb0b4647bd417da