Malicious PDF — malware analysis report

Static analysis result for SHA-256 c801ff986895ea31…

MALICIOUS

PDF

74.3 KB Created: 2021-09-24 17:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eed0793b93a6093ef3d00051d9e66802 SHA-1: 89922c97725d6369f1ede3a6ae52992290eaa1a8 SHA-256: c801ff986895ea3154dd424dab9232eb1940008000f3efb0aab5b9529974e6ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute phishing content or malware. No scripts were extracted, but the nature of the URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=itracing+smart+app+for+android PDF link annotation
    • http://alacarte-grafik.de/userfiles/file/jipilixolu.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/20057377834.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/82079209919.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/mulazexorekisizabagogagul.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/46852478080.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l86hm19eom4ohlava3tu1umfhf/60573677571.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/05ot6f94q5dtkcimr517jg9ava/43982341436.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/61579505747.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/wubupo.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/wagoguwapa.pdfIn PDF document text
    • http://dentali.cz/files/files/96162480063.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091021085073499.pdfIn PDF document text
    • https://artbynela.com/uploads/file/putigalufedonadisiriso.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nepemifebu.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/16831393505.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210921040005.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c5154ce2702c82ba543b5e745e894bd0/61743949182.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/71985475657.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/8687194742.pdfIn PDF document text
    • http://airzo.net/userData/board/file/4566837750.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/jefubumaxalokevedirekeji.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bea70f649---daxera.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/31460368305.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_off0000b8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C2 18824 bytes
SHA-256: 39839317fcd3a29065a117bcc0ca98568b5fff30dbb23f1f7ce1a32551601a23
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 10736 bytes
SHA-256: 2828318bef9eba10003209f850e5ebb231d2a038e6bf44b901c4fe3991d28ab8
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1