Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81865bf57899a00…

MALICIOUS

PDF

65.1 KB Created: 2021-09-16 18:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92b63b74a9249e45195c1932fc80f2ef SHA-1: c36beb62042cb371570e68c494fb268bb9a14488 SHA-256: f81865bf57899a0058f87420e6b817cdaec6c27b18957e4cee8060518b1eafdc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised CMS uploads. ClamAV detected this file as Pdf.Phishing.Trojan, indicating a malicious intent to lure users to potentially harmful sites. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6720

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613877fbabf26---49689487954.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gnhsbpors6l74rbi5o67idf6q8/8454343907.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/13850713223.pdf
    • http://vce34.ru/attachments/file/zojokeroxamupabozukivopix.pdf
    • https://pasarangroup1.com/contents/files/28066657545.pdf
    • http://ulrike-mayer.de/userfiles/files/lomewapilipaviliguje.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/julojanitabakop.pdf
    • http://lsphc.com/userfiles/file///55594988866.pdf
    • https://ingatlansos.hu/images/userfiles/file/25363118655.pdf
    • http://mobilahomedesign.com/userfiles/files/92092840205.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5f459d883---42175335090.pdf
    • http://wellfoto.cz/pictures/files/xozakibenunabup.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/23770df3848cb1b067731ba766cc194a/rijexazepapinaxitobiguk.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/88bc06133f940e851e2ef16b0203d06b/dalinadazuzu.pdf
    • http://lg-palette.com/upload/files/vexapodifi.pdf
    • http://eikenhorstgroep.nl/userfiles/file/77060358644.pdf
    • https://digireg.se/upload/batasuduxefazetumanoki.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/32615321207.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/mubovapozofipanajerirofol.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613278920950b---dazejana.pdf
    • http://apicn.net/upload/files/78109725471.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/kinarofagurenagutimu.pdf
    • http://exmar.it/foto_fck/file/fazuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=excel+tutorial+bangla+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b930.bin
57fce313eb523f98e3bea0f2814823acaaa9c4ab9a33a80a428eec0a389f0060
pdf-font-stream PDF embedded font (sfnt) at offset 0xB930 10952 bytes
font_01_sfnt_off0000d244.bin
46cdcb1123b33e111249034b3bfcb262fb72a5da00b92a4b7b8403ac4302104a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 17920 bytes