Malicious PDF — malware analysis report

Static analysis result for SHA-256 a813c01d2145ae76…

MALICIOUS

PDF

85.2 KB Created: 2021-05-19 01:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f8e27d4bf25d030e6de9963015cac8 SHA-1: c215cfe318d13b0cf74585df0d5b665cc1704012 SHA-256: a813c01d2145ae7631a4bc6190d490c782f229b47485ee189a109dd739bf4012
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to game guides, which could be used to disguise malicious links. No scripts were extracted, but the PDF structure and embedded links strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fbd57ed005b093ffbafde5bdba2c6cb3/34165258220.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4b0cc948---mekatofikuwelew.pdf
    • http://marthomaiticherukole.com/userfiles/file/1577636669.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607874f68f4cc---87553118098.pdf
    • https://biothiennam.com/media/ftp/file/bozugivewuderawagur.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d6113d79---kimukimibiwipotobaluseza.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ncbh2giq04cnlts2305s18j71u/21157047384.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1431e4ef5d20921e31dc8ba15f1721/wawarisedotaxo.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074468fd3756---vejer.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f35ea8c0---gizexivaledinig.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/1o1tsaon360kn7upfqc32s1l92/gurefidevorepagukogafuta.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ea61f7f0667f69a10e5f0216057a8e97/rapisetegosunixewelajajot.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869db671bb9---68189880895.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4ea6a0a2---xarerotomivojuxidix.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//50020224667.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=talisman+reforge+guide+hypixel+skyblock
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001040b.bin
5d3fe8d5ad8ce43e8346e26042317aeaf84cb5df3b170adbe6b5c7eb76ca6f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 5692 bytes
font_01_sfnt_off00011739.bin
f382b90a39dee3dbc4c353a47bf791ae8b350ed351c354bd01316cf84ef8adac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 12056 bytes
font_02_sfnt_off00013fc0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC0 4324 bytes

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