Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afd84aa1a67e647…

MALICIOUS

PDF

60.9 KB Created: 2021-09-05 11:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bac210f381d48ec36e0a145bb5a78f55 SHA-1: 014bcfca70f3699324c2c3dc091d7643c7dc8c4d SHA-256: 2afd84aa1a67e64727852f5a27b3352d6ae5a622d283e9a73872c25891ce830c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including WordPress installations, to download further malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=smart+village+essay+pdf
    • http://harasim.cz/uploaded/files/tafurobegozune.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bc6b537b---19958660068.pdf
    • http://jshtextile.com/UserFiles/file///46785932551.pdf
    • https://orcasproje.com/userfiles/file/36535185731.pdf
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/75529850658.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/42911a57710011e600f6bde2d170febd/konev.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71855082ee---laralozizi.pdf
    • https://fizjolech.pl/userfiles/file/buboxujokivelelukab.pdf
    • http://labsshop.com/d/files/pofuduxodojama.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607939d1ec020---ziburub.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/68d36adb85d27e8de225124f35eab9c1/98229215355.pdf
    • http://dolphinegypt.net/userfiles/file/99350945838.pdf
    • https://cgeminfos.ma/upload/file/7679037465.pdf
    • http://emurus.jp/userfiles/file/raruk.pdf
    • http://przedszkolenisko.pl/userfiles/file/98809696100.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8f77e9b7---84067526205.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/94765309959.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/67267439143.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad019b533c---zotivogozawasen.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/82378c91206de8e6560613a2bfcb8b8a/zoladar.pdf
    • https://arrayamed.com/userfiles/file/4681390696.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4cc422ce35b5e27742826643313ef728/josewivufu.pdf
    • http://aviafond.ru/userfiles/file/84189906910.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad751dd45a---19290745475.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fa9d8a89---1410478714.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_off0000c1fb.bin
44d6e3a1c40b7023d698490085b4f9aefda62099cc82de3f42ba6443b7ae7237		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 10872 bytes

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