Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8a9a1c9188ab57…

MALICIOUS

PDF

84.1 KB Created: 2021-07-22 21:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09c1f1808f30d6654ed9320a70f91d2d SHA-1: 68ab554ce8bd1d9da47299c2b7738450a349aa5f SHA-256: 2c8a9a1c9188ab57c16a9db4cf289e51231e2449246975a5593973176c01a8c8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a link farm, with several pointing to compromised WordPress sites. One heuristic specifically flags a link to a compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or second-stage malware via the linked PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://belst.by/upload/file/pikokajivizuz.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90473a9cc---19727894944.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98c25736a---zorag.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/v55edsar6vtgiql76ccjhj5hh1/72345579871.pdfIn PDF document text
    • http://df-foundry.net/d/files/regasegafawuj.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca431b5125---valelutaxeg.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2b48529e707dceda5c08dc9b879dbf42/60409371619.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ebh4fu23oc66auheh8atj3mv4/golamojegupikowoli.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/cd51cb63c8e2af6bd6132cc1b5c2dc55/51558263900.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jebetivurobigido.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6051c170---wazonemojolaz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b37cf00b5fc---tipoganutabufotaxes.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/bpnmjeb5mjf960p499ije2fkgu/vowufid.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/16528301024.pdfPDF link annotation
    • http://tortsurprise.ru/upload/redactor/files/23350138765.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/motuxovujibuzorigoge.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/22664548756.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/pazasetedezagidaxuwafexa.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/papowidenumev.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ab45a03cc2fd211df6048818465dc27b/10328204361.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6b2f1675---84980648213.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6874fa51e0---85050066225.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/76493313724.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bc067b55---sajisagatimanigexa.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/wunew.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-24/20210624214354758464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=aaa+protective+servicesPDF 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_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16572 bytes
SHA-256: dbeffb05d0e516c3f44b57aebab113f164b8a7e1c38db71c67188ac71845de54
font_01_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 10264 bytes
SHA-256: fe1d1585a7980ece3b029500ca2c571609390ed553d5052569635dcde1cfd818
font_02_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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