Malicious PDF — malware analysis report

Static analysis result for SHA-256 c675b22afead2be3…

MALICIOUS

PDF

64.8 KB Created: 2021-06-25 08:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d4bfca29cac6e764e48aeef2ade0a072 SHA-1: a6a4d37d6532d617227dd2336549742e0e1d8751 SHA-256: c675b22afead2be3ad9ebeb83ebfbe7aa95a15977c5c98c2f70447760b4d77a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further content. The 'utm_term' parameter in one URL suggests a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=diary+of+a+wimpy+kid+books+to+download PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3a2beaeb65745bbe96668d96c325b3ef/nagidatemamusiwowo.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/80257497762.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/476d600cf9af904d641a24ac44de935e/gakezivorinibotabalu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f77a4a5dd---woxenif.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mazawejizeterejenuki.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/53091101364.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad4e395ac---tipubekuzabodupibi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0ec83cfb703ebce62794a50553a3db0f/98985762963.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee25b097c6---81256268904.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074c83a360ac---sefidibutazububizad.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e921a1e2c---rilijaparojiwodapirejub.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/guzoromubebudosavil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085658f19d5f---44601961039.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f92afc8c48ad0bd467f29308601f7833/molivemuvepedugija.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1bd4c10b---23803539223.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/20303364260.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8e5256ad---41433386184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E8 5252 bytes
SHA-256: fc73823e69b68250f5765647f18bfad36a164c631f4db75202cc6fae7e462772
font_01_sfnt_off0000c3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BB 10948 bytes
SHA-256: 630b9b5b269df6b496e26171349223edeb7765c2916b8e1229bba981ce702aab
font_02_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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