Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f51e9ff054f046d…

MALICIOUS

PDF

60.9 KB Created: 2021-10-12 18:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d438036b85e6de90482e120f0d6de9be SHA-1: d9ba25e6d791978d455a9f2a540cf73ded1158c1 SHA-256: 8f51e9ff054f046d93ec88085bc03c4378a9193bcc76718442b9fca13bf2b323
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of multiple external URIs and link farms suggests an attempt to redirect the user to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6844

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://crewmak.ru/uplcv?utm_term=create+table+postgres+foreign+key PDF link annotation
    • http://aalzkj.love-mrt.com/upload/files/11787106105.pdfIn PDF document text
    • http://wirheiraten.de/images/file/91961749412.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/gavoxago.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/34066151402.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140712e11e58---65356248625.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/8500166318.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/sepili.pdfIn PDF document text
    • http://slsnn.ru/content/files/39044948968.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/73545594901.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/jagurifatowixunowepepex.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/disotamo.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/sawulonipidaparirurodamaf.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/biwubugenaworuxafadavulus.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/xawor.pdfIn PDF document text
    • http://change4best.ru/upload/file/lajesolu.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/tukowiditomerorovadimemog.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/36579518456.pdfIn PDF document text
    • https://kudusde.org/resimler/files/23175499692.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210917020931.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a025510e4---fakubutelunonuwuratomawu.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/22887160597.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/dufokini.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/besusegojotema.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d0b0b4bd92---logamilam.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/perizul.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 15368 bytes
SHA-256: 5f97f1a99b6acf5880ed1c6502b2bb99098ccf51ca0eda95682acf663d32a7e2