Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f048a40aab019c…

MALICIOUS

PDF

78.8 KB Created: 2021-06-10 08:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b3849c00a74c89108672e71633588b SHA-1: 301e707e480c76f7b04fcdec4e241fbb161351a0 SHA-256: a4f048a40aab019c6c19d16680dbc0c8c015331f5f343cea0ff045fab99750f7
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and embedded URLs suggest it's designed to trick users into downloading further malicious content, potentially through a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=call+of+duty+games+offline
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ff2759dd---58162533231.pdf
    • http://asustainable.com/global/file/sivapugewetarubugav.pdf
    • http://csc-021.com/userfiles/file/20210610003135_095o5u.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070693c90bbe---zunezivuputumu.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0gk239hsdgo93tqp2pcc5oee95/91369805435.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32731e127---gujidulul.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073741ea23dc---kadifumamerepobidikuj.pdf
    • http://charivne.info/images/file/zitipumiluxefuwit.pdf
    • https://bawwabatrizq.com/userfiles/file/73384445959.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762d1f03264---gadutuvuxubusipedejajane.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5730dcbea4e32bf6a153bcf4bf46908c/toforabelewugogogu.pdf
    • https://biocoils.com/img/file/juxaduzot.pdf
    • https://nepalaviationmuseum.com/userfiles/files/deremeg.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16099407f75f06---xizazusogekole.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f111b9dad3---jumekid.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b343275c8---dakuberawepafidoloragipiw.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084beeca0b93---ferumanaxepol.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3e7c15db322bf6b14b84e412031ee1e2/49452253040.pdf
    • http://somsit.com/ckfinder/userfiles/files/zakedo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cd.bin
af7e564014382bf821f2db74d41de55b32aafe4dac6535d2a51fb8bbbc45469f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 5136 bytes
font_01_sfnt_off0000f947.bin
4935c4fcfe13491be42a26b07d334b5fb77d3691a38190a136f5c62635825fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 11220 bytes
font_02_sfnt_off00011eab.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 4324 bytes