Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f594d672055359…

MALICIOUS

PDF

85.0 KB Created: 2021-07-23 12:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 483b74024e38ee15ecea9a7153e089d8 SHA-1: f8517a2aa9a7c426135a8e556aed00e17e4a3def SHA-256: d9f594d67205535911005cfa1a42d894dd2251d01b3f725384b590cecb5db150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vijyaiprismcrm.com/userfiles/files/tapozufu.pdf
    • http://krakow4you.pl/krakow/files/38915827183.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/maked.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ldud260u0bife56ckufk0fqpr7/zomoju.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/dawupigifesijedo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/438e3juphg2nh6en0lhr2j59vl/xexozivuvon.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/geruweredalolim.pdf
    • http://brezov-gaj.si/uporabnik/file/69376311731.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/79fa552d83383ca02056ffc512e6163e/remejunagetitaj.pdf
    • https://justbuymeds.net/userfiles/file/jaxeredu.pdf
    • http://siciny.pl/userfiles/file/wigewi.pdf
    • https://cochleartudaskozpont.hu/files/mogorilizefobegavaxazuni.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78596e2009---milifotaj.pdf
    • https://noithatkuongthinh.com/uploads/files/rulozaxadujirodizukozoxim.pdf
    • http://adance0112.com/upfile/editor/file/xikedimi.pdf
    • https://isabellepieman.com/userfiles/file/36373135602.pdf
    • http://campbellelectronics.com/uploads/dasiro.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339f592384---buvibivesos.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c7671a4d---derebegarusisovuruj.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba222394a77---64935670400.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5323fbad281111bb5cf1cb000c41b8e6/fufosow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=grappling+strength+and+conditioning
    • 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_off0000ea5f.bin
b423fef617770a490a86549c5a031921154ad4c484d7cb14cc78d06a096c8491
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 16700 bytes
font_01_sfnt_off000115dc.bin
78609dfe7729ba7a6aeb36abd1b7674f50a150bb2df1c58e19dc6abf5ec7c4aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10832 bytes
font_02_sfnt_off00012e97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 16792 bytes