Malicious PDF — malware analysis report

Static analysis result for SHA-256 be54ac9634991662…

MALICIOUS

PDF

111.6 KB Created: 2021-09-18 19:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8537e7ea0feb0449f5bc2e0d8e8b7325 SHA-1: 69817dd92ebeef0557174ded6d32cfdd969c8158 SHA-256: be54ac9634991662d1f0caac0ee9286dff571d4e12366a11d7962216b2559bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to redirect users to exploit kits or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=study+chess+with+tal+chess+tactics+from+the+grandmaster+mikhail+tal+pdf PDF link annotation
    • http://greece-ex.com/images/blog/file/60803263913.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0581c6c25---53864522762.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/16141334782.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/3553516437.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd2c7c10f3---75588420370.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cd5fd244120073c9e4e5a97e994e6992/gupatavuditoxap.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/11897291485.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/fadeb.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/85736473618.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/lojirepopusenakuk.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140128a2c506---mosevanumifitonalunaxugo.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/57472501987.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/48245918155.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2ab420167b3780ec65f37f5312827cd7/mezojodox.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/61837000267.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/g7rv3uei4ap112ghufq6urerb8/85444244555.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914090854330919.pdfIn PDF document text
    • http://hla.vn/upload/files/katavovatipe.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vudogosibopurexofibaru.pdfIn PDF document text
    • https://partnermind.cz/images/files/veborivonakusavagi.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/96143252344.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/20830008281.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sasagokixamoneze.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6C 11532 bytes
SHA-256: 40243b37f3b3341268b3ffcb7d74ba46ba76cd792b585d9b55fe923d16cb4747
font_02_sfnt_off00017675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17675 21668 bytes
SHA-256: 5c7083b3aeaf98f323d4e0098d91251fb5a1d6ee6e800df3e93c76c72b6b20b8

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