Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa15e4dc14a150…

MALICIOUS

PDF

76.5 KB Created: 2021-05-22 23:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec7c65b7f283b6562f5bbea3419ef04 SHA-1: 2ac37962a8879ffa7e5bd579b1b86183baa07a60 SHA-256: 0bfa15e4dc14a15084c3bd38635ec6ed28d00787f738b6cbe94e5d8a8f917ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=mahabharat+hindi+serial+star+plus+title+song
    • http://agrobud.net/uploaded/file/44778439846.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785ea3c9b9b---70495066012.pdf
    • http://alphasigmaoverseas.com/userfiles/file/revumunefijunolotu.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9ec5b19f---27327613678.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc38d12068---tatewop.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/edf81f06ffc18a1dae3b36b8df55cf6f/45640052998.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/t9pdu6j7tl77m3dmf7hghl8u83/41880368220.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/zinebinekagagezu.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c780661f18---26630446879.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8437d8cee---93998439352.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6303e46d---29296005566.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/95aaf2373bd8ce63d93bfa2047c445b1/fetetufazazuzepabebatiga.pdf
    • https://angkortaxiservice.com/userfiles/file/61069469123.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e8c31b2cd00655b0f97bec08fbbc11de/75167724576.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd355a2c9---suvekosibuzemo.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/90t2jcnmjgvs8jgnscpvbt7lt7/golilivebumo.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/1ma03qbssu7op09tdfagadqq7n/kuremukopigunevirotonamor.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000106cc.bin
b5e2ca14da877100039584eb5cc9d1cf9b64e378ae2c8308d3bb92e20a515535
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106CC 8852 bytes
font_00_sfnt_off0000d197.bin
710eb03782ef1feaa10e25ac027c34d24495e49775ea748ac514402b6cd2a7f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 5364 bytes
font_01_sfnt_off0000e3d2.bin
37e7c5d40b20fc92730170b242943317aea6ca782a25d03c2586f99c578aef1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 10148 bytes