Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b1e54cf407c790…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 455dbfc37673cf11c9683bf3d63576cc SHA-1: 7a3e2c5d57d780b4c5d3e0e5bffcc0f964618048 SHA-256: 54b1e54cf407c790a846c8ea6fb9e28b8432fc1319d4d82a91b8d50131f996b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=how+to+transfer+photos+from+android+to+ipad+via+bluetooth PDF link annotation
    • http://mnogonomerov.ru/uploads/file/derufile.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/72109389940.pdfIn PDF document text
    • https://badoza.net/userfiles/file/43947420301.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146aed000276---38511172877.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/14818931411.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613248171df67---96132516379.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/52359937434.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/eb165d55cf39e6f4928890e618961385/sedijoja.pdfIn PDF document text
    • http://orthodoxnews.us/file/82307391243.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/15318908923.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/gogowuwekuzonexutikigisa.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/fibilegilesaxazep.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/13274941256.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4af69c5a---mobipovivix.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/dosederowomebufazobade.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/95961753864.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ac26e16e13e803f8c7dda658e624fcf8/37520275826.pdfIn PDF document text
    • https://deloge-nt.fr/media/photo/file/nemipudubopepul.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/21368225395.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/39924038834.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lafosiwubokededejiwefi.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fifowilalofojo.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/8281939466.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/3546932008.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/45136056595.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_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 11144 bytes
SHA-256: 3a1edf6df427dc6b2e3b40cf0ab094d99bb14098b0f804024f5ec357fe43ae5d
font_02_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 18156 bytes
SHA-256: 2c3f8859401a557c50d6a06ca37ad8e60d8826a23cdec6dad07237b80bf996fd

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