Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dff4591d97a16a8…

MALICIOUS

PDF

72.9 KB Created: 2021-06-13 01:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f879347a7d10f236a2635bafebea509a SHA-1: ad1b0eb9e7d3ee65639c0605f75c976faa22fca3 SHA-256: 7dff4591d97a16a8e1cc4619751658af003ab1b70b499db8295b6574f69b544a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress upload directories and disposable hosting sites, likely to download further malicious payloads. The embedded URLs and the PDF's structure suggest an attempt to disguise malicious links as legitimate content, such as a 'status punjabi video download'.

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://inwebjor.ru/uplcv?utm_term=status+punjabi+video+download PDF link annotation
    • http://buildinggodskingdom.com/webcms/file/pemisumofeporopapi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f885aba621---kitogovira.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac47cce127---28194182933.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/66d43fe98c067b9a375e40b84e293606/joxuv.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iq6bdiq8h197flk7208eiefn5v/29753280625.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/godajakawisiti.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xumapar.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/tawafulikasalilap.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/59cbssl9ihnm5qo0rq7dpi9bbf/32988702583.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/fixowuvefarozi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acef40de671---surujomopewol.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a873d3f7---9899439993.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a36fa25c38c1555f75c6a91fbf69eb58/15365674968.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ecf65ad95940fb0d726beff27a51f501/21040931130.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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 5328 bytes
SHA-256: 81064d28ad9a7de3c43c32452645ac53a566aaaa3b1225a8b856155acfddd7bf
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10620 bytes
SHA-256: bbe3e237b7b43124716c307b6b6198ccaa889e8eaf640cd88c669dddcab306cb

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