Malicious PDF — malware analysis report

Static analysis result for SHA-256 6731c29ff290865b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 15:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac26690f0b61a9edbb9d59b52c3ba957 SHA-1: 643b540606659f6f9995422af36eb40a28eb0e93 SHA-256: 6731c29ff290865bc1639f9ee79b7fb4a81518476ff7c696ae14decad07caa30
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing content or further malware. The PDF itself does not contain executable scripts, but its structure and embedded URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pixomot.ru/uplcv?utm_term=bus+stop+method+division+worksheets PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d52dc4c8e82ca6862b6516332d335443/98885237749.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/50008a84b2f4a270e921f6ee3c7d4bf4/jejaresunutolodabofud.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/31685142251.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pk6nqpkunmnhi9ckg4bcf66du7/zazufimi.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/1052139329.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8brkhg0e764i4oero4vu8fam0g/91930704284.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/dolapitujilo.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/jelazeziwagu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ba2788974---19682445563.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/51945149442.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/65638649786.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/49513ceb116ad91ce2756b58411dec56/lelasizososololanebafi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b5157a112---muxetumikizat.pdfIn PDF document text
    • https://dm288.com/slicice/file/vesut.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/88164590511.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/79669752582.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f1aee829---jatixirexenopu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/62b522bd534e34ab7666d13fc32b4a49/tasibed.pdfIn PDF document text
    • http://vanhacollection.com/images/files/86340164068.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/11413203395.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/85526140280.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/71130800872.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/34059825364.pdfIn PDF document text
    • http://klefmarken.se/upload/file/68937152236.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/40802558693.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/21682609099.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/28142701207.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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10848 bytes
SHA-256: ff89eb15ab565e47ed313d55e00c2ac6807a99ee38c167569b81d966071229b7
font_02_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 18104 bytes
SHA-256: 66bf26cc9655cb9c0924c77ef178b45964b082057ea623adb7e489e99d54b3e0

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