Malicious PDF — malware analysis report

Static analysis result for SHA-256 95259bb8ab2fe6fc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 17:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 420a588c3e42f6c5fb711aa6aa09b587 SHA-1: e7f9a5d57eb81615b2860ef4ccba658e79e46b01 SHA-256: 95259bb8ab2fe6fce73f6365fa9cbfb62000828fe44c71bad8681ee4b5cfe00d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of URLs like 'https://nomylo.ru/uplcv?utm_term=free+convert+pdf+to+word+online+large+file' indicates a lure related to file conversion services, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=free+convert+pdf+to+word+online+large+file PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb375aaee92---91108696657.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d640ac7710---pofubifavojukixegok.pdfIn PDF document text
    • http://emannsltd.com/userfiles/58289136389.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/matop.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/70685793244.pdfIn PDF document text
    • http://webursitet.org/Files/file/19854637971.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/terezetuvetako.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/95465379939.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/bavenakesimesupoviz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85dfde842---vezajetuwupofuboxef.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/sanukud.pdfIn PDF document text
    • http://parfumkin.ru/files/files/mavopavazek.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061408003786.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/liretosigudi.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/nimisekefowa.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c580a0af62---98627335849.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cbf170548af5cd107363240c2cf9e63f/gojafixawaros.pdfIn PDF document text
    • http://hncastlecable.com/d/files/39300084511.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/sopikipuzitegodomoduzekul.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/17026934056113351beebdd.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/xomizol.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4494f3869b0a0a7ee99cdb82d1dbefc9/gesowakerivedakiwuxakojum.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/d0mhm1tgalkugiiham50uqgj5c/86418736173.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/gupoliwemo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f0f2777f5811389bdc4b8df5849561a5/vigoxebudabepupuxu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/3988170228.pdfIn PDF document text
    • http://www.fotolia.comIn 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 10756 bytes
SHA-256: d3eb3f31df49875afe19c204340a84c9e0c3aa1a6bf272ef9f1ed9ce49cc3390
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16900 bytes
SHA-256: 5356ae43717ce179d5d649df34dffb7eb505a4dbfb589f891cb6a9c8ebe8eb67

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