Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75b84acefaa7430…

MALICIOUS

PDF

164.7 KB Created: 2021-07-21 22:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91537bfc6863bfd40dd13610690941e7 SHA-1: 24375b559f0f0ba9e0139834c34a922436053d87 SHA-256: a75b84acefaa7430ada8143283172801517aba508e32f279d0888eed56a959b9
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c361f1a9d1---98010842675.pdf In PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/98747468182.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vhlrg7hmt281kdhp4vdjuhm4kv/jebivadenutu.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/89167551509.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e8eabb0c5---tefunezukar.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a47cd4a8b---61889285971.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a256ac7ac---dasedulapigogizoj.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/ziboxoviveforuv.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/94466713556.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076865e1546b---4328022661.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/71110977920.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d0c5c7b30200deb159c27ec9dfa78e35/voxokot.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840dc692b5f---83755514667.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd640e8aa---16376254711.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbf703d1e---fujerebogupurag.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/xumifawivoxat.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/apuv8ukkvm4o4eee0u6qefpaf4/59824757710.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332d165dc---dibedox.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/slmrhb2a540e6fehjl31r1mroc/febubanujewawodaxelebazi.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/gekogomujares.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/05921e55f073e345c5e2e36e19dc2bfc/sowuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=beauty+and+the+beast+backstagePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E0A 20600 bytes
SHA-256: d04b3a899ba12fe48f597320def4c8c7a4f5538fdc7638f511c570d4399070ba
font_01_sfnt_off0002423e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2423E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A55 10792 bytes
SHA-256: a67d7cbeb7b4d5eb3e78ed9027b0519cc0f6c340e8a6fb1fcba1a7449573e9c6
font_03_sfnt_off000272f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x272F2 4580 bytes
SHA-256: 1c4476548ec3cdf08bd8c27bfc07c5007488459149a6c87cf1ca3892939dd94d