Malicious PDF — malware analysis report

Static analysis result for SHA-256 a574ecc56e34869e…

MALICIOUS

PDF

88.7 KB Created: 2021-07-20 08:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa76448068c0e0268272cdeed46d5c5d SHA-1: fd4273c5abaa0a8832c476213419b82de49a47b8 SHA-256: a574ecc56e34869e3bd2c921199513fc1bc5a8b172d88398f2ed0b1fa9d749d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://albino-pitti.com/pub_img/file/6892486697.pdf
    • http://ldbell1965.net/clients/85689/File/11756835715.pdf
    • https://istocdukkan.com/userfiles/files/wibunadixavixakigolokeviv.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/99ab93a608eaced649a97ee110ab239c/repezajetejixobok.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baf9fcd9ca7---femosogatesobuxeroredas.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/jowoxebatobafeteled.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r609et88t397sjcsg37l0btfs3/tezenuxozazudod.pdf
    • http://taxicityplus.ru/userfiles/file/75226758822.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dae7be365---ridexokeg.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c1268697d08f936d4ea74dcba6aeea01/jilazoxenerubato.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/939f196290042b80e4bcb80c9d6b160a/fogijeku.pdf
    • https://kartplast.com/resimler/files/76323304752.pdf
    • http://ahkjt.com/upfile/file/dirutasimusulufudof.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/zawulodemid.pdf
    • http://www.themixchange.com/userfiles/files/34486351700.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/81095093756.pdf
    • http://goopenapp.com/uploads/files/winimapo.pdf
    • https://gites-les-bardots.com/userfiles/file/garuxapaluxija.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4f643b3e51a88d5caec22ad48885d70/wofazip.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5e651081f1e3d15e1397057ff141f225/73754314878.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0760039bfcce326057a7277d32173c0f/14637660679.pdf
    • http://fedime.org/imagenes/gezoxurevojura.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1cf46f7eaebf2201bd7147ff2460ee92/pojekofujedagol.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105231121347372.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efefbd7237---fonopowiguj.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5025124ad---39466711670.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=labour+law+case+study+with+solution+pdf
    • 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_off0000f669.bin
1145cf2f4902d6f94b38aa6e5b4ff703509879198a5158dc8515c9b67074d50d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 17536 bytes
font_01_sfnt_off00012377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes
font_02_sfnt_off00013b8e.bin
bb32b9440a31080cbbc4a3e9ca6f2ed0325e7dbb7ebd79b49a79b1752674f9d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8E 11112 bytes