Malicious PDF — malware analysis report

Static analysis result for SHA-256 5940f7f9f1ce5b41…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 19:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69f6a56b569e5871c0eb6191547412f3 SHA-1: d17c434cd5c51ca04136a081032f527db7eb4e0d SHA-256: 5940f7f9f1ce5b41876efd71dacac86a960cad74770deda4de6f1de765559951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These sites, in turn, host other PDF files, suggesting a multi-stage distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pphu-joanna.pl/fckpliki/file/10649245496.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091a972a807b---44767353531.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a05690a04---75686390447.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b117bb26394---52975135533.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072de2eba7dc---vexeribupefibow.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077698dcf6e3---70054962654.pdf
    • http://rafaelokazakov.com/file/pewijibotosi.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e14f09a70---bijebenu.pdf
    • https://anctools.com/ckfinder/userfiles/files/sufalusolimanavutoze.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082908aa7e1d---76437539837.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830c3140095---33620255840.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g85dj9j3k27ob87k9fcfu9rmp3/6751631205.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7cp26d7f5li3ckfqhbcf86gs22/xawitifobaf.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2dcf498db---10625576628.pdf
    • https://balaji-technology.com/userfiles/file/zawituxepizarak.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lezuluzofasapidufesiz.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/17700240562.pdf
    • http://vipnjl.com/userfiles/files/72844069931.pdf
    • http://sungsam.net/userData/board/file/21546625569.pdf
    • http://hydrem.ru/images/file/doxasipejos.pdf
    • https://denizlihorozu.com/resimler/files/lebezirelizegopet.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6772a350ca---95113878484.pdf
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/busixanoxefuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+a+anime+person+easy
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93d.bin
47795492e29a78ca6bd4d2e9fe36b290b7d4330585210637f9385d37ad431bd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 10700 bytes
font_01_sfnt_off000101c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 16792 bytes
font_02_sfnt_off000119db.bin
3774c9d756b02b513ee5ea757436c49c06c9756c58cb970f8a0426b96d0cf691
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16668 bytes
font_03_sfnt_off000144e8.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 1696 bytes