Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d5f0ae75d55765…

MALICIOUS

PDF

89.0 KB Created: 2021-06-17 05:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce789f5eac5ccbbab4ed63a0b54b4d49 SHA-1: 599548cd6cf0e8a330bfc172a22ea3383731f1a8 SHA-256: 58d5f0ae75d55765a6cb1aa2dbc8f7a790e13b287d9c611298f88a85e63e3afa
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=how+to+get+world+quests+bfa PDF link annotation
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/86244689194.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788438c8a2d---46230150523.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/solujur.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb2cdfe31---dewusipez.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/15105294380.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/s9ktrqa97slbti62pk7v38td9j/serilufab.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8682e29954---tenogepulireli.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/67457195453.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/949079a32c6ee66a105cdaf222c0fe2b/19210806542.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b306c5b37f5---15351882179.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/panusifozete.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c934d7757---35634635493.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/35988c54726551afd52055ffa68aa2a9/32663165602.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952afbc5dda---golavusozonujinadudi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 2952 bytes
SHA-256: 013fc9f45313cdddd5762e6694753e55f6a85ad2eec225b6e17fd140af1ee5c7
font_01_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 5396 bytes
SHA-256: 74e866bc1d22275d573b12bcc49b23cca9a3b06007b8a1b2510d6c2865e711ea
font_02_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 12912 bytes
SHA-256: 40a76b83d9ce031fffd09a7b3fda6b3f09cee2249086742cb5fa95377dbf80e0

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