Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fde9313fea671db…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 17:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e248a63864ef9f1d809d0d8d50c09292 SHA-1: c2f483462b1568618cbc02831783cc8c0059168b SHA-256: 0fde9313fea671db1ed5c0d3c59b3474595f733547df5b9916b115ec5cfb12ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/sukejol.pdf In PDF document text
    • https://aimhc.com/userfiles/file/92567588642.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/julabizisuzax.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607440aa58a00---61192229153.pdfIn PDF document text
    • http://falerisztika.hu/tmp/27534311666.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/subiwobenu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16129ba296ab9c---74061316358.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/73395417335.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/tuxovomidojikunubi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/71531027632.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/40257257102.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b75181e4d8d---vixapanaki.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/redigifadiv.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/voxotunivejowewovodaw.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2561920a8fe89511dcf82e864ebbc5b4/65020307969.pdfIn PDF document text
    • http://odumakus.com/uploads/files/wojup.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/vezulewebonurakafinunon.pdfIn PDF document text
    • http://newworldss.com/uploads/file/pavuwalafuwar.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/96135185572.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/zalepikisapazigofijon.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607200428ad26---najetug.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607789225378a---nuvusogurixusez.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/4408450515.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a483fad8d55---noromuleruzubenovevak.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/juxevagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=introduction+to+bibliology+pdfPDF 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_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 10636 bytes
SHA-256: ff87116b73e594e76abc13368a05d44abfb478019e675968698ade4799393dcc
font_01_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 18440 bytes
SHA-256: bbb9ff099251953c15c93ceffd5328833643e55eccdcd84042070194e550aa85
font_02_sfnt_off00013fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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