Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd11f5b7465e5032…

MALICIOUS

PDF

84.4 KB Created: 2021-06-20 20:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ad41b20cba260e709470a2c19c4261d4 SHA-1: a75d58c4b2bf1d8732fcb01d5c2c3e1bb5deec80 SHA-256: cd11f5b7465e50327e3486e25979a1bf2e58cfe89dce596816d03e658686f02b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9b6a9bca637e89a460055863f930101f/juzaju.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/xolexasirekalok.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/89779613672.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/matonugixojozum.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef741c5194---sibisebuzusobuzimegaguje.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/lexuvofalesavonabim.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jufejosexiboxonixi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b79a2c4bc---68783212539.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/566h7jv447njf1uierced9pc4d/fonakavifudafolapopukuz.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/49980902537.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/69d1d5d74909605a9575ca5ea8d17f88/xufupakugilevopuwet.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zasijezugekafifepozejes.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/safepulozusetalige.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/papadexedupepewuzubavizir.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774d5b074f---vadoxiraromane.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/54588fe0f1125e8d69da97b098c3f2c3/56206293650.pdfIn PDF document text
    • http://klefmarken.se/upload/file/wonolipigokugudox.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/8022286290.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/gozutome.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/kenatarotolo.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
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mcu+movie+watch+orderPDF link annotation
    • 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_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 4904 bytes
SHA-256: 61b392ef58b29fd66d7287bca84be414f0ceb512ef823b5e73f53602051c5c33
font_01_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 10724 bytes
SHA-256: b4aea2361ff087f0253374f8c42fd635ec99767f3d342d691320f19cba189b7b
font_02_sfnt_off000135f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c