Malicious PDF — malware analysis report

Static analysis result for SHA-256 8216b2adf59f532d…

MALICIOUS

PDF

81.6 KB Created: 2021-06-10 22:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4a1ea21315bc07cc37d688836235a5 SHA-1: 4a996c4b14a24b5a874fa4117b6fbfaa340fcf78 SHA-256: 8216b2adf59f532d8d6572333bf211ce56d2785062da99680840fc642a3114b8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to distribute malware. The presence of a URL with 'pubg mobile hack android download' suggests a lure for users seeking cheats or exploits, a common tactic for phishing and malware distribution.

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://krisoc.ru/uplcv?utm_term=pubg+mobile+hack+android+download
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8de6e015e44411ae4593458369bbfd80/41527034683.pdf
    • http://sevimticaret.net/userfiles/file/melomixobovoretamuw.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a6b9e24d---24626125552.pdf
    • http://altinay-law.com/images/file/88574034505.pdf
    • http://kaies.cn/upfiles/21060104485059848803nl6n.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/79e6a6ffc38307bb60d203d9604b525f/40608030527.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/14e5240e92cda7409c071faac6590454/52141542437.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af14ae4593---70207797651.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c4a35d80---wiwunalorebokad.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rr5kslj8i4915tt0dsq27bnf15/ronofikewezugekekinur.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947b3f2d052---tijijeliji.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7c5ff99a8f7a9093f3bdd559195ddcfd/barabogumizuwejagisebo.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gjjs7s3ai132rt539jnumo45q7/96602501780.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c5f40ebc---53603457082.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf5df2ebf---dazitijivobonuzatojasu.pdf
    • http://amadpich.com/userfiles/file/wamularavinasebukibof.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_off0000f3da.bin
1f382ffc71cb5719372e91f35747bc2844f61580256c3744a4601270e8de01f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 5272 bytes
font_01_sfnt_off00010591.bin
b7ac602ccd8b75ed585b36cdaa55f3cefbfaf8388dc58af432512804b695fff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 12280 bytes
font_02_sfnt_off00012b6f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 4324 bytes