Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce01313fe9151a0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 14:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57778054e502443e43c718b59e7c34a1 SHA-1: 3b8074bd89008ef821b085893aaf79195c17f331 SHA-256: bce01313fe9151a0d656308ee3cb4339a8367af66af46d9a2e279b98e62079d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=ml+apk+mod+download
    • https://100tmt.com/uploadimage/files/20210902122021.pdf
    • https://vmwarts.com/ecovic/file/60870451437.pdf
    • http://rent2day.ca/ci2/userfiles/files/posekupuxizagasotakunexem.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2uap3qabm83t9g7lhfp7jdfe1i/gedanirafijunumenagako.pdf
    • http://mecaniquekd.ca/upload/file/47073360518.pdf
    • https://drivetripper.com/userfiles2020/files/8242031999.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/kinudeloxedor.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/99040001500.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/kowidolof.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/napalilulaxetili.pdf
    • https://bloomlight.pl/_bloom/file/74890635705.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/tutesev.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613959564343b---vopijitulovawoviweled.pdf
    • https://sapporopools.com/contents/files/dazadogibilososojelalojan.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ff6e506c430c49865865404d5907cd14/lewoxijozaxezujafataw.pdf
    • http://aldobini.it/userfiles/files/39883200744.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390b03ea967---22156803587.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/dobiturixisavajim.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/19230288982.pdf
    • https://gangnampools.com/contents/files/febulifabedoremakojebagi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba34.bin
a20f5791d24bd0b2b3d4e404f4bf8c0657b0a1a8961562dc546c8e28bc8490c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA34 16848 bytes
font_01_sfnt_off0000e559.bin
8a1c89a965ccd632b87f28fb065cd298e85249c31f191872711ba2c0d1ade16c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 10136 bytes
font_02_sfnt_off0000fbf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes