Malicious PDF — malware analysis report

Static analysis result for SHA-256 c988cd389695692d…

MALICIOUS

PDF

109.9 KB Created: 2021-06-13 04:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 38e03ca6cd1e88741bdfadb643fcd0fd SHA-1: 30aa3c250382775e40ae382c59609d9031a58ac7 SHA-256: c988cd389695692d38d9a419efc128e64b3d6b18447908046efcf9442fabc74b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=pokedex+number+800 PDF link annotation
    • http://acecaalcoy.com/userfiles/file/tupekefudumomoximapax.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4d5623f5---niberoxabulik.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7998345958---7565430377.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60f16f939---fugavikula.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608d245fce357---dukobonarikelokix.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a814f61cad1---90465447592.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/b59f5d8d626655b5579473794df59943/41278604417.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/15706555524.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/38087916134.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/94586169988.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/82aa4d586ad7b206a09d00df2a908b28/92455475899.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/40945664558.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce2dcc7e3---bopofoputugu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/semamogoxabivufire.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/10c4c19035bf235e1f839ccd6da96723/vewafewafupuwijek.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/55ccb89c2b982059621bccdeeba388bf/19439612459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 5168 bytes
SHA-256: ff7d4c22a4e849fef036a1b32cb55e6f4f99a2ac614930f3cbe9a1cc6387fe88
font_01_sfnt_off000157d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D7 5160 bytes
SHA-256: 71129673bb48aa0086e0a3fd840e8965b5bf7d1895de5cf15e13aad73b840ee5
font_02_sfnt_off00016957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16957 12540 bytes
SHA-256: 0c2391fc867d6a7919d664141f695fbd9b2c6d270ca45fc2d9b6631ed49e3e27
font_03_sfnt_off0001932a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1932A 16248 bytes
SHA-256: a7a18fe0031db8c4bd711b8db26c69dc991d8760ecbd3054ecd9c2d9e51861d2