Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c9b66cdf0df7b6…

MALICIOUS

PDF

87.0 KB Created: 2021-08-05 19:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7dfe215bdda00d906483c6796e754851 SHA-1: cf5c4db02791e3748834ee7222c9a82e758c34fc SHA-256: 97c9b66cdf0df7b698c35deed87a5b0d10b0b5c4580d850e480e833977ed4661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and links to websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=shimano+acera+rear+derailleur+cable+replacement PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a5a7c6b675ea62da4b34d32ac81832dd/depomuvaposenatodi.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9di2idn6jkj9d7sfg12mfvoilb/25512426710.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/73407845909.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/3113572793.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51e7429e9---31633249573.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/47494587095.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b841b35185---66381516968.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/16239670015.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/63038783990.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/832a24a375c408f99553037936fbdbc5/65994844331.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/puxiliwedike.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/52321850645.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/9817268389.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/92884016107.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/newunak.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kqrnq04hnok28gtevdf7dljvs6/depozaropilugadetulitomu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/64podl4c75tat9cimip6vdjcj5/nevesagiburerenowixawumo.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/wifilikiruwilepozikovorox.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/sasadinesajejoma.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/55724923973.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac28238726---betumuseneson.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ee8d41a40---masetopobafapez.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079920e492f1---30011063734.pdfIn 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://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_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10928 bytes
SHA-256: 4bc0cf4c931db60b2f33ebc4dc41eaeeeb8707a2f112b6edf663ac470a43ea4b
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 17628 bytes
SHA-256: c180449e48b6c26e7847da5dbba5c9becde944b85155bc87f318240c390c1a67
font_02_sfnt_off00013687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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