Malicious PDF — malware analysis report

Static analysis result for SHA-256 5326918d1b9ede16…

MALICIOUS

PDF

83.1 KB Created: 2021-06-30 04:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 904a6b4085c0b2e7d4d321dddba19fb0 SHA-1: 57675450e0d94d917af2bfaf4d74e7bb7599a07c SHA-256: 5326918d1b9ede16f9855522ccc280a5fbdeb93ad11ec61019a5f9ee3ece147c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit user trust by appearing as a legitimate document while leading to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://garglob.ru/uplcv?utm_term=early+payment+penalty
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tn3ofgc671fj3vl1der4ojjtra/54319008005.pdf
    • https://dianthusindustrial.com/resimler/files/52895900439.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/80255922786.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa5912ab8---jexutusunisomasev.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b6228631---16054356839.pdf
    • https://watertorens.nl/userfiles/file/34317076996.pdf
    • http://thebankcardservices.com/uploads/files/gemorivebajelefoja.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ce9f47b0f40283654156a54d35ee37cd/99116534643.pdf
    • http://klefmarken.se/upload/file/1991717281.pdf
    • http://willbramephotography.com/38687350526.pdf
    • https://istocdukkan.com/userfiles/files/nudadajusebemomixo.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ijmcgollpr26vs2trddcoqnsd4/71699615934.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/0lh4ga6f1gdmevv873tr7dqbc5/73587068936.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f57504e8---75769213713.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd9ad0b5f---11874566880.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d28a35240---70529989690.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/97024852ac7c80276531e286c3897303/23948291460.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/kogubulivezuxojugezapa.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160984d1fabb14---pepupol.pdf
    • http://abwingsbuffalo.com/uploads/files/mefozap.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d784170f8---14183491993.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc143a6a45e---finejulaxiwegixej.pdf
    • http://gfhs1978reunion.com/clients/56625/File/62829629715.pdf
    • http://automsystem.com/UploadFile/file/20210511175709021.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad5cc5bc8---takedelas.pdf
    • http://mashtalkandil.com/userfiles/file/rejuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56b.bin
450bee5206a717ec9e2520432a3e2c62abd4c2c8df3ce539d1e23531af9b33d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 16576 bytes
font_01_sfnt_off00011095.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 16792 bytes
font_02_sfnt_off000128ac.bin
8ae62086e4db0cdab22e01eca061ff02ffd036cbb47e7bcad9bd29ced6788d62
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 10132 bytes