Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b0eee98246104e…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 20:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2059fa3c135aff0c5e3fb45760bcb4d SHA-1: 614946775cbda3ad4ae0dc1e08dd21630dce626f SHA-256: b6b0eee98246104ee0757f7eeacf906cf8c861ec504a96141435f487420e2bce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mynigaoe.com/upload/file/20210525070836.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca14e1457---24148403709.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e11184d87c---28414541525.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a706eb02bff---jabunipilolaloriwa.pdf
    • http://e-district.org/userfiles/file/rediletinonaxejolow.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/03e808dced55bdbe3ef9dc0b671719e7/86022626332.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5ab1ab88ee9964bfa53af4dad7613560/worabalevoravakara.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ibtj1rur98mlnndi5erprs2t3o/64997116598.pdf
    • http://amsasecretariat.fr/userfiles/file/45146163794.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rts485fh5mi2m6nobr3bsro7qk/vapuvugoxejezofatowadezi.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac305286670---44667162172.pdf
    • http://karthikeyanjayaram.com/userfiles/file/vukijebe.pdf
    • https://alarouba.com/ckfinder/userfiles/files/27057333459.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107f46f3be---zewawosipadif.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085773325dc0---rebodevukiwozeb.pdf
    • http://infrabud.eu/fckpliki/file/litogo.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mojawufirezibozosatezewe.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/5v45iosj58dbk377hjlh8egk25/5582171428.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c970295e9de---62498360637.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/aufifgna6p4cokdfms8288pl60/98292820087.pdf
    • https://cgeminfos.ma/upload/file/muzujeditosesaxumafevamul.pdf
    • http://diamondsnspurs.com/clients/12200/File/bunesojadot.pdf
    • http://spy-military-labs.com/userfiles/file/mabamaneno.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/53a2ede591c8bacc6b0a17141b37a94e/vusukafexogorivaxuxiwuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=class+11+english+reference+book+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
font_01_sfnt_off00010434.bin
023ad2c372c6a88c4fc757f5fb74dc76894dd60385dd6b50f6594315c6ae248f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 11200 bytes
font_02_sfnt_off00011e01.bin
8f125501d9be10634c851e134044c46d0412cedbe258e2d99ac649a6d7e70d44
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 17676 bytes