Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6581b00617a621…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 16:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25c3cf74ac021f96d24c73f106934300 SHA-1: ed004367994dbea4a999238883d16ef6e8a0eb8c SHA-256: 8b6581b00617a6214bc11c593f9f1d877873b81b400ca05308b331de90a83468
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency lures further supports a phishing pretext, although the document body itself is unreadable due to encoding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://akinmedical.com/uploads/file/30773233348.pdf
    • https://festival.bg/fckeditorfiles/file/lapitepedudogibani.pdf
    • https://pet-fashion.ro/mm/file/37507408135.pdf
    • http://ahxxzx.com/userfiles/202105/file/74321866909.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/369b216fbe11eb6fad9e8b58443316fa/52617516838.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2318256add---tonixazevanejetuvubivoku.pdf
    • http://gernano.eu/gfx/userfiles/files/5250191834.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae7216c707---60486299474.pdf
    • https://energooptima.hu/upload/File/74028309959.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75c88cb7dc22388e315edc3c787bf281/nusibanufexewofevo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076878e5850b---zupubiwita.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/02foo42ulhsqh9jbdeo1dqb80o/jolekedozosekenixaxoda.pdf
    • http://coytex.net//ckfinder/userfiles/files/10646537225.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/xidizefef.pdf
    • http://aceonlinementors.com/userfiles/file/927609507.pdf
    • http://kleinschaden.expert/userfiles/file/53680135912.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+messenger+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e512.bin
480bef1da12c223426f6e08aa92988c27fd877cb0645c2fbe347c8bc8b4f4a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 10848 bytes
font_01_sfnt_off0000fde6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
font_02_sfnt_off000115f8.bin
dec4ab60ac6f6786bedae8098fcf1f09cc9387cc6244f500a1aa0c5c8e86ec18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 16872 bytes

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