Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9ac36a3cdb0fd1…

MALICIOUS

PDF

85.4 KB Created: 2021-07-09 14:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e746c84795eeb4759063d8d99bbddb8a SHA-1: c15af2020a7ed0601e583fb187ad7237bac2d24e SHA-256: bd9ac36a3cdb0fd1cfd53469afecfa9904d5da1c06d8a735fa844bff0c201937
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

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 https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5b2ff59ea81708152f097acb461af43b/wesemimuxuwumuz.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f2271f7e4f2cfcd4a535265f9fcba721/duserozuzunadekapuzebafag.pdf
    • http://tnslib.net/userfiles/files/sasakado.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2899668ae---77455651960.pdf
    • http://morethancars.nl/uploads/edytor/file/86039088329.pdf
    • http://synthecinter.com/userfiles/files/4618743718.pdf
    • https://mgc.to/sites//web/upload/files/sudirakulenejikipobu.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160852cb87b77a---jorar.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc67ae3fe---veletol.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/24222860322.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad91f819c0---19459516529.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/gusurisasigavugepugox.pdf
    • http://aylincinarli.com/fckfiles/file/tuwofirikilemisep.pdf
    • https://bustotoronto.com/userfiles/file/sopumabutapetam.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712e4fb33d0---87275238879.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dd55e999---69219940532.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/37819453945.pdf
    • https://guijek.com/userfiles/file/litubazekevowajozajozul.pdf
    • http://rotang.net/userfiles/file/32479124938.pdf
    • http://poiskvod.ru/images/file/jinupivopiwaguwotamewive.pdf
    • http://lycee-elm.org/userfiles/file/38620574191.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ba60a4ee772d645fe8ba6b9a2c8dfbca/fanifex.pdf
    • http://fecirturizm.com/resimler/files/danobirolip.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb280081122---24925848702.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d372f9det3cd78hjla5f56kui7/jizumabo.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cda5947ce---firogurir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=objectives+of+business+firm
    • 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_off0000edc2.bin
0efb8083d8f71991c6f40d8c82baaefbd7f918192895d4fd54175339d5c7a3f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 10748 bytes
font_01_sfnt_off00010681.bin
df3f6510962175c19688bd996cd6f1c67c857716f1aae857435e5a4f31711616
pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16204 bytes
font_02_sfnt_off00013038.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 16792 bytes