Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b1ec977c244fea…

MALICIOUS

PDF

62.4 KB Created: 2021-06-24 21:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1642860ac0a744b577cf5c26bd522a12 SHA-1: 3c2124a30cab7e830704aa7d3b674d88f9550a24 SHA-256: 98b1ec977c244fea2e78ba72a21e0d76fa257c8c8230ecdb838b724576cbde85
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be junk data, further supporting a malicious purpose rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/c1qqstshd49f8mtp7b3f5sfpi8/10753653272.pdf
    • http://mdsalon.ru/img/lib/file/vulobixiliroxat.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c1d72e9e42d0f97370c8e61c015a71be/jabomitawaxaweditakexat.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed16616a6a---34942673040.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qcjj3qjdnhgu7a2icp543teqp3/vomip.pdf
    • http://nfc.soo.jp/file/fufinumo.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e230beeb---99744196462.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6cb3398b74249530c9239977dee51ba5/73495685625.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/mudiwirapagudogos.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98aaf016d---99349019524.pdf
    • http://travellightnepal.com/userfiles/file/kofowevasezixeb.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ttlbp1t9t16sk0mava3e229071/79792170185.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ujhdslpc7qin4a2aog677j4hio/66332050670.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/brrfhmra5vmsjkad26s8as6e9l/neridudutaxuwu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b89b2f78.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/a53ca7b82b361904e2134a7402d23695/buvovelarimubakanur.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a2fef9bb---dubezejelum.pdf
    • https://divinenine.net/userfiles/file/guzuvulafikeduzazonasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=intermediate+algebra+aops+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b94a.bin
2e7eccbd1396f8ebe57c99011c0c55724f4ec196cf63d39c853e8ab5b5d6753d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 5440 bytes
font_01_sfnt_off0000cba7.bin
3c6dcd1cb9b5cd2e4a4342b66f992e7432fad054db8c5ac87c5c37032281af84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 9748 bytes

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