Malicious PDF — malware analysis report

Static analysis result for SHA-256 abffeff29019bc0d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 19:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03720e40e76bda3fe96c8e28af39ad2d SHA-1: b2400438d62e976c4e8e68a11cff005c2d4a4127 SHA-256: abffeff29019bc0dc6dcf577f74906ce7e08c7d71e364f6a583f6172f41267a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many links pointing to compromised WordPress upload directories and disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=ghd+sports+free+live+cricket+apk PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s2kjokib01ud04ri8r8o47m8b5/borabulalopipulaf.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jesobepumanoletusewepuxe.pdfIn PDF document text
    • https://stvorki.ru/files/file/68786913835.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/wozelexowamexebiboxiwevef.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/pifowisirofez.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/ramemuwivopemoweri.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/63346800264.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/pogabufivapibikasujel.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210920000843.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/vatidevepozegegeleziva.pdfIn PDF document text
    • http://pasaru.com/upload/files/jomovofulofoboninageruwab.pdfIn PDF document text
    • http://mamam.by/upload/File/file/83407598984.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2e84354bed5bc4bb64fe16f4ab62cc77/45738497685.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/83210641049.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/sikirakoxomi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161401ae1ac7f8---83649623645.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a4ae961a5---najugodogev.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/69288954273.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/34563961894.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/wabepobifumutivituxile.pdfIn PDF document text
    • https://mytopics.it/uploads/file/31697679798.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/palazogekuxemazizek.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/jidebofazebogipitakesa.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/74945615311.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_off0000c531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC531 10812 bytes
SHA-256: 25643502c027de83f9ea372c741d629e2fcfc162ea2a5e0eadce2065c8e209b8
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 16164 bytes
SHA-256: 76fc06c7324d11711f3b0ff587e35333afc6ecb07ab5441f602d8494bf6af03a