Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f5126f8cc658d7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 19:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e14c86d84f0b94f244e1408efd2a36a6 SHA-1: 62e9fe1b2e932c976f08c3449590b4cfd22b02bf SHA-256: a2f5126f8cc658d7d63915f965d5ed4da53dbc506e2240fafceb79c14be83c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e71f2576c---20838436109.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/7b31ce1c041f1467e33525c5a4e91147/75121311655.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106291113183368.pdf
    • http://worshipedia.net/sites/default/files/file/84624942656.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/cc7d38da8e71634bfaeb601fbbb2a9d7/48683403059.pdf
    • https://twr1115.net/files/fckeditor/file/tajoladezujetopaxexege.pdf
    • http://itcck.org/upload/editor/file/gowagokudi.pdf
    • http://weiddy.com/uploads//files/202108011711126043.pdf
    • http://i-harmonics.com/upload/files/95748757431.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd594735a1---bijisigizoput.pdf
    • http://underworldgear.com/upload/users/files/vaveruxinodokutebekigu.pdf
    • https://km2804.com/ckupload/files/71820369060.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/82572293847.pdf
    • http://agataklimowska.pl/userfiles/file/95319949.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a6a9b5ac---dekisifigi.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91682c2cf---kikofegusojarunegero.pdf
    • http://saga.diamonds/uploads/ckfinder/files/88873554392.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6d61ededa48a20927d726a3005c7e5e4/tagowuzazeja.pdf
    • https://footballsod.com/images/ck-uploads/files/daris.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac7cc319d---80652389094.pdf
    • http://malbreil.com/userfiles/file/leferidoraguzopuw.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c7a73481c057f517b3c07bbffcb682dc/fajebirexoga.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109024f9200c---wedulaloxado.pdf
    • http://caogenzhiben.com/filespath/files/20210830050706.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609878d1343ed---pazut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=trigonometric+graphs+gcse+worksheet
    • 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_off0000b642.bin
089e20c0a57255a0a9dce16b453f5c9b3516ba98fb9691e6810be298493a62fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 10916 bytes
font_01_sfnt_off0000cf6b.bin
290e37a95b0f63981ea3d0a2b5c835784a910a6df75d33b191d00978861edd96
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 15444 bytes
font_02_sfnt_off0000f69d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 16792 bytes