Malicious PDF — malware analysis report

Static analysis result for SHA-256 a883fb72b91971c9…

MALICIOUS

PDF

98.0 KB Created: 2021-06-25 20:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73aaa506bad20eb378f2f11b6b57127a SHA-1: b4cdb927f71d94719e21b79cd485da10bbb1053f SHA-256: a883fb72b91971c97192a7976665f0d1e88d278064c8f892a23beeb9e67ba58b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://yaqeen-eg.com/userfiles/file/xamaviwalumavog.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vvojvd4592q48m0qkskh1ap9nj/faririko.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/gixuxewekubun.pdf
    • https://kartplast.com/resimler/files/nibuzininebepeselavoler.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d001ede41d1---20853030192.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609298ca301de---19709082104.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ee2cfe9c---89149889019.pdf
    • https://nicosiacaffe.it/file/55510546379.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22f955687---zemufopefadazu.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58206ce3e0---97620377214.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043f3c129d---lunuwidiramowuwalesog.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d5bd29b8---28934020661.pdf
    • http://aarogyamedico.com/userfiles/file/tewamupedusilelasa.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b3d121080a23ac5ca23313ea5fa818a7/82828804574.pdf
    • https://dannysacademy.com/ckfinder/userfiles/files/20525147245.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1291fb73---garetazosetedaraveku.pdf
    • http://accessprecision.com/userfiles/file/79921134472.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/aeee8eec6b3000e87844b3f635f3b831/denuj.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d8b07bb648c031dfe6eadac56a9c46bf/11670122772.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080eec1316db---19260645718.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d8ed63ff8203f1c137ecfbbf27464b84/53243887864.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160903f4963525---27232277850.pdf
    • http://liburnia.pl/userfiles/file/dezonede.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/ab09a24adadb693120dd93953c9e179e/kewefaxerudaligad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=process+control+in+textile+manufacturing
    • 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_off00011677.bin
c3fb92f801c66eef2bf7ff24d6f060523f30d6227ff040c66f946963acc10f24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 10884 bytes
font_01_sfnt_off00012fa9.bin
f50f652ef8093af5a9ad8ffc1de5df3cf94b454820cebccbb17e720fb60e37c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA9 19732 bytes
font_02_sfnt_off00016278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16278 16792 bytes

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