Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4776ee533c5c7d3…

MALICIOUS

PDF

98.8 KB Created: 2021-06-27 23:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c469e9a2b3a340d28110f27c62d0021 SHA-1: 865c3c8ccdf36d835b66b102c9821bcdae8ebab3 SHA-256: a4776ee533c5c7d3643deee2b432a15cffddc99d2117dd6cdee6cf5bdf8932e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://cowichanmusicfestival.com/userfiles/file/93712576744.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ecfcabda---xinaluxegebenefitatol.pdf
    • http://katyababash.com/images/uploads/file/riwasawe.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4bf027001---damos.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d226028b3---pofok.pdf
    • http://ubestsports.com/imager/files/20210616143809.pdf
    • http://bearings-home.com/userfiles/file/dubitewagizu.pdf
    • http://amphorabeautyclub.com/campannas/file/kuzutizazilog.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6a0a0afd---saxez.pdf
    • http://paillasse.hu/userfiles/file/15072690915.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42cf56bd7---girugonabamitut.pdf
    • http://abpaluso.com/upload/file/15319209777.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/99947946366.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/122e43becf5f1da651e70d421ae43188/laxosunaniwekewarux.pdf
    • https://poolpoint.be/uploads/file/xukuvesugisebof.pdf
    • https://cmoretv.com/userfiles/pexajiruwaboreladavut.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e80935222e1e5751922c4645bdb52749/jopufelidasarilu.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f3ec47b81---32223927041.pdf
    • http://surtek.biz/image/files/20150115_235824.pdf
    • http://hongdacable.com/d/files/47892693142.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ab1a0862bec1c4d8d95d558e3b2c5392/72994935475.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/bdf8677036ba94754a2a8fdb665fdd92/24493244949.pdf
    • http://donateagift.eu/userfiles/file/geriwebikogekunedi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nked74irciitr500p7gpcpb5id/bevekomoroma.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d128bad0c---vigox.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609170d2b6ce9---47160258475.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=all+the+reindeers+name
    • 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_off00011a91.bin
1b3a5089e5a7ac84b6889c49523b4618e9548a76303630f62b50e2f77334b871
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 20368 bytes
font_01_sfnt_off00014ed3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED3 16792 bytes
font_02_sfnt_off000166ea.bin
0cfa8fe8f58e21b952262e02eb441f697df79dacc1ab3c7b56924e83cdb3fca3
pdf-font-stream PDF embedded font (sfnt) at offset 0x166EA 10376 bytes