Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41ffa2206b21780…

MALICIOUS

PDF

74.0 KB Created: 2021-09-29 08:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5d7086c4e8577203a78b875aa7656a5 SHA-1: 013599ee0e8cd2e721b81e7d1ae456f218a4d583 SHA-256: b41ffa2206b21780430f60321d41de07bb0716d2e0b2636a446c2c4d6c2401f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary URL, 'https://laborke.ru/uplcv?utm_term=abominable+torrent+magnet', suggests a lure for downloading potentially malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=abominable+torrent+magnet PDF link annotation
    • http://gdfsztal.com/uploadfile/files/marader.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/32dbb2262a53256106828daf9ad90c94/16198888887.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/tikasogomewibizukesiwo.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109140406093775.pdfIn PDF document text
    • http://punaide.com/userfiles/files/kefisawuburubod.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/lugas.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/189ce61192d8f28a69970935484f15bc/nokizigafonidujo.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/69140051652.pdfIn PDF document text
    • http://lblussana.it/images/file/94534998164.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/tisujegubemaf.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/155f80e59799e8e5109427931cf7a554/nixif.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/89520812718.pdfIn PDF document text
    • http://e-sportis.com/images/upload/72035142657.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/52960931071.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/77919009864.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613fceb01b540---47809783059.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6905030b---gilod.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/58662190999.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/43250898303.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/49459675009.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/kusubukelenafomimov.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/3957292318.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/11033907707.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_off0000b93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 18184 bytes
SHA-256: 796700337e13107ed1468c24172231ea4a14f5a4590596ec5192adc90769b698
font_02_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 10404 bytes
SHA-256: 1be8669b768fec277896117866154b51d8dcbc4e85a5e7d0ed7023475e08a5b1

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