Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea274be7e47abcf…

MALICIOUS

PDF

86.1 KB Created: 2021-08-18 22:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 740d9fa77f3f5d08bcf957df51cbe792 SHA-1: 413f2522bc143ced8f483dcffbcfd6ff3812e8a6 SHA-256: bea274be7e47abcf960ec3c1c1176f2d13ee0d4ec9df5c369d477d4973fc6a30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of `utm_term` parameters in some URLs indicates a potential phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=game+killer+apk+android+free PDF link annotation
    • http://www.minaakshimajumdar.com/fckimages/file/venotebumi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb27a2cf6e---5332604332.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160758f3a46cfb---gamogob.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adf046eba47---85978699137.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/zebubusizijozis.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/16798657638.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/47091926766.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/49953069394.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nr5gniohec6het0vi520m6fe77/nosoluginutut.pdfIn PDF document text
    • https://digireg.lu/upload/nexefanofik.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/luxemabovodijijadozipomek.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/10dd1ff2652ec0cb8640d69a63c4de2c/64019489138.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210614043052.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0cc2a7200346bdf6656098f951e97fcb/kafatuwudomob.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/75015127779.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/kivuketaliximolibano.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/74577498149.pdfIn PDF document text
    • https://blugarden.eu/file/52347552316.pdfIn PDF document text
    • http://someteme.com/archivos/_20210624044504.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/8708373526.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e1648ded---72313271768.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/panowugaxilekifapimutus.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_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 16612 bytes
SHA-256: 2955a9e49877209c80d432be5c48945abb2d2e014740c72845d3253f4aa7d130
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 10524 bytes
SHA-256: b7c730bc30c5d21d452da1be49886a0b8af52d6f3a9d7bd2d2372f373c1c4d7c