Malicious PDF — malware analysis report

Static analysis result for SHA-256 b039afeaac2d8752…

MALICIOUS

PDF

85.0 KB Created: 2021-08-30 16:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43302e782ca42a347c5709c1661d894d SHA-1: a44262ecf61b6267e6d875aabc9fbe39ef53bdcb SHA-256: b039afeaac2d8752e4e204858ece0083227475c99004c5e43ba895e20c4a6d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=food+safety+management+system+manual+free+download PDF link annotation
    • http://6nergy.fr/6nergy/sites/default/user/file/35490724873.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210708_214134.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689c65a237---rewiluw.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/lawaje.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f80801589---zigimuzu.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/xepedokene.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/8921600166.pdfIn PDF document text
    • http://sdds.be/userfiles/file/rasemotikekikolekosuroba.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/berovunegoxevotejuzojanas.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/topoposenegi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/45242573265.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebef94e06f---8075749769.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/7255978848.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d0ca89f6945f8828f5b8576ce63a345e/26671110066.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/5827925852.pdfIn PDF document text
    • http://i-physiology.ru/upload/1489426228.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/legiwezig.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ed9adee6c1e620c9810f5fcb217e38f/79400437571.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/35672537281.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610384d783e37---gemudurumuge.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/agst83c416ejss3uq8v67eff4u/doselamirezolukog.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffef15e3d7---1880145398.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16119b763da502---tenutazofagosurulukis.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/gesuvipeberuruvulowudaguw.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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 17032 bytes
SHA-256: d30c495431ddfdc13cdf36ca01f1495fa46f16e4ffd65c0488d702c8f3890628
font_01_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 10884 bytes
SHA-256: 8c6f505708cbc8ec78eee5d08d26f3675813c144aa412939b1e957c4d5a778f4