Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa1f31816c4e929…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 09:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5b1cf10e0b03df0fe7ff7e9aedffc36 SHA-1: 5535913fc3239b8e774321a55d70f4182ac88cfb SHA-256: cfa1f31816c4e92923f6d5ece4109f240920c8e4907c8301eaebb644ce1dec02
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful sites.

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 http://anhbanglaw.com/userfiles/file/61097509708.pdf In PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/vuropanuwabujudotozuxuxi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611058d071df4---23573904010.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/38332578454.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f8de1e7fd3b---14205384002.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/figipavenowiselivevir.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210807162658.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a02af52dd2f---96773265074.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73a3e07a8---92780918953.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6853b38d6---41288819656.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/mibusezuvozigu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160989af5459cb---xalazoxari.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/kavupeli.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/mipotasezep.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/migejulodi.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/pidumelulerubujawuritiw.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/zikekasifoxozopejevas.pdfIn PDF document text
    • http://hongdacable.com/d/files/losamexerufe.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/tetulikadotigeze.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/69a455bced5fe0415076663a51310632/26409545608.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/t6sh544u9st487mevu8nta5vbp/30967096325.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/30815284883.pdfIn PDF document text
    • http://spharma.ua/files/file/potenukoz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/o6ribcnglbh60vv9eb6c0htejp/55940941479.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vevexuxekufimanabojijaw.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/26d382558d33a13be1e4cbeaee610d0c/vezobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=molino+manual+corona+bogotaPDF 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10504 bytes
SHA-256: a9d1aef27a2ec766bf3354b111312da261252fd316d21b59b263781c588545c9
font_02_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 18692 bytes
SHA-256: 7c689fbfa80ec7dd6ad3b91d1d21c32eff253bb393621f4ba1181a19450cc9c4