Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f720312f68e244…

MALICIOUS

PDF

108.4 KB Created: 2021-06-14 03:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 07f73245908f2e655c2291690280e8f1 SHA-1: 2d4ddc412db73976ad6e953bfcbd37766b39dbb7 SHA-256: d4f720312f68e244dd0a6cdb64b0b44ded932026324d26086a3249f6754a3c96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into clicking through to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=resto+druid+talents+classic PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b772d31a---fapotakesiwizafejopuwirug.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/05f7ea16055328795f2bb485f7308956/65268118044.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c515ac8104d---jotaduxikefo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3oa6c1dp2p507ng40c8518digu/wavuxovunox.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45b5a518b---jifarorisagevagimipisogux.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d36be4416fba8dca2b57b39b723f7770/43639614417.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/17573430095.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1c97595ea0c0beee4224cd6006dbecc5/87932947806.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609554cfe73fd---58823761297.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897ae3ee38d---dareje.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12209249685.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/pebunopiwupewepazavas.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/lojofagelepetetip.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/miranifavobovuz.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/sinuwimiwevevibemopifid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA9 4940 bytes
SHA-256: 3dc4fd46229e700359512661ff64eea661bc1fbf20c2a7406514f4bfb678021a
font_01_sfnt_off00017c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C85 11676 bytes
SHA-256: b675236138fbfcadd3946ab5f605da8fdceee7d836c0324d25c9f89726337fce

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