Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e580490597bb87d…

MALICIOUS

PDF

56.8 KB Created: 2021-09-26 21:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb6828275572462e42016da4bedc03c SHA-1: 1c3612eb9e2ca48d329b7e7193b6212df7933a6c SHA-256: 1e580490597bb87dbde63f9496f0722bde14a22e138c698bd0cd8da8c9b3d301
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents a full-page screenshot to obscure a clickable action, further supporting a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7186

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 56 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://crysiq.ru/uplcv?utm_term=isaimini+2019+tamil+movies
    • http://findingthegrey.com/userfiles/file/45766279065.pdf
    • https://stw-nowogard.pl/download/file/71853496186.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6bf6ccb0---jodapapenapotejideg.pdf
    • http://teusz.pl/UserFiles/file/81437145215.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/76200988503.pdf
    • http://fukaofoods.tw/uploads/files/202109171150244730.pdf
    • http://lynxauto.ru/userfiles/file/turusupoxi.pdf
    • https://ontech.vn/images/ckeditor/files/94493568065.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/todafen.pdf
    • http://stalmont.eu/userfiles/file/85042630804.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2d444b2d981c9942908d22c45d6738eb/wogalepikonaz.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/78506694088.pdf
    • http://edeins.com/userfiles/file/duxitonovafi.pdf
    • http://diskacme.dk/images/upload/file/81261898499.pdf
    • http://theexplorerthai.com/userfiles/files/nogeni.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m1kbu6q252bca1ldealgk7dfcj/61467195629.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90920738479.pdf
    • http://boissee.fr/userfiles/file/92205179454.pdf
    • http://achilleferolla.it/userfiles/files/rupenorixibapotofojuge.pdf
    • https://www.ijdsir.com/ckfinder/userfiles/files/43626899271.pdf
    • http://tele-klass.ru/i/upload/files/kupunovanodiso.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/44179042584.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/dajakoramasevugix.pdf
    • https://nexapos.com/upload/files/47169401617.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aec9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC9 16792 bytes

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