Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e9d9717473773f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 16:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00cfb5606a521d500c368a9ea80461a8 SHA-1: b2a777dd57cc3df23ca2002619023972c65b24ee SHA-256: 40e9d9717473773f8723e6fd18486f630e680878abe9d4fb95e3ae66b7872cb1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised or disposable hosting domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=time+complexity+analysis+pdf PDF link annotation
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3fef2e48c4508aede47601e70c239f07/rogeteteje.pdfIn PDF document text
    • http://micruts.org/userfiles/file/78382070924.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/gejijevagiwuregim.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/rizezetiwinilarojikuxu.pdfIn PDF document text
    • http://gtshotel.it/images/file/nijatezigonetoxoxino.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/13601346934.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608008ccb2802---93737420108.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gafatezolofan.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea22cd1a166de6575cc4ffd2ca817f18/56589067581.pdfIn PDF document text
    • https://noventa.cz/media/files/file/xodidemijisavubebutor.pdfIn PDF document text
    • http://huefpdf.org/upload/file/24317001450.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a986d243fd---mageluzogokuremonexu.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/33842607538.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608323cb98f6b---nelejifobuv.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d986e0ffec---mipuxitaferakekoni.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/bc534956e2c58d710a89a85469ea0804/pupaketoxazi.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vawinaladadomatedataw.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/bamipubukozuwopere.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qik5jl7gsmk6f5kvemm3kcehvd/55779024945.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf9c311d99---40730562902.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b068b12bf7d---vekixajusorifikikavutuzew.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/14456198587.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 19148 bytes
SHA-256: 172b234b43fb3aaccf9729b2541df6132e10d2ec14b45df3fe9b1c1a8834539e
font_02_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 10860 bytes
SHA-256: 124f3b415d7b186c1c2ac80a1dd4d7639bec4e8cde45d460557df5af7b2203e5

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