Malicious PDF — malware analysis report

Static analysis result for SHA-256 972dd9fb6c8e726b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 15:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4631591ab5604fd376edd5fb719cbf17 SHA-1: 9453303c16ecb7c417625136fd259a8596089efa SHA-256: 972dd9fb6c8e726bda56ba2a4d02afcad0226cfc7d29b8674062566fe3b0e3eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://europartner2.pl/uploads/pifilama.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c8257da54---dasesukinibefexaxoso.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58131301828.pdfIn PDF document text
    • https://coil.hk/upload/files/kotaxidozopi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756c4f38176---34743140577.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/86220896781.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098252cd0403---mebasuxogefuraz.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c21b907a4f3---kujudopatilujezafej.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/tasuwilarixizatitovo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007c3d976e6---84821654805.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5sjeh5fkcnksd5a93kh8p6rgpu/rasapekir.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/87493672785.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45689566166.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902171432.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1737549b6671db6b2a4d0faf2f7a0e22/60553943687.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a59882a34c1a54603ee8d66d2aff797d/pukeginutifotorosasipu.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/73885971609.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210802_02AEDB5753C264AA.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/80435659043.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1hbm6h3f237c8mfsta0osfmh00/xowofosazofu.pdfIn PDF document text
    • http://irths.com/upload_files/files/87408392115.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/dagisubefobir.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae37012e19---56434061087.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/ruzadobiwe.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/16213171440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lab+assistant+syllabus+2018+pdf+kpscPDF link annotation
    • 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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 11164 bytes
SHA-256: bcb39efb32d929d5cbe88bb92d80b5e6bf964e6534c4853a23f561ecbc054ed5
font_01_sfnt_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 21140 bytes
SHA-256: 1c8567178966fc4ef643ec0d91254e0308b0363feb2085879174bf88a55b4dd9