Malicious PDF — malware analysis report

Static analysis result for SHA-256 b120bd695eccead2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 03:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17add25e266f3ec52e3a697ca748deb0 SHA-1: ce8f60029b9c251bd1306eaa4df1e61cf8391f49 SHA-256: b120bd695eccead2f16c6b2b8db8462523dfbb8d9aaf2b3d56cc5331b3b69121
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://www.sensiblemachines.com/ckfinder/core/connector/php/files/nuxan.pdf In PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/jinirebekanudufereluf.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365fa48501---75059290688.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/89083321273.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/lazivunawawe.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/laxedexofukagomuvabewo.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/foxelogokagagavonavo.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/20960235869.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/23175184449.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zituxodajixof.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c1d910976283b38d03bd1eb58c12cbda/72967353136.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/52207453834.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/kosar.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/lejomu.pdfIn PDF document text
    • http://royalgroup.at/tmp/80023252650.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc3794ead---94303852569.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/dojep.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/savuwifewujajepadowajili.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/gusad.pdfIn PDF document text
    • http://industrialdevices.in/uploads/80708428959.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumopadinamujas.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/57521360244.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pakunupip.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040753307368.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/61170244610.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/rawasumugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+speed+run+simulator+codesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 19552 bytes
SHA-256: 11f8a3410205e358565dc3c36e0ec72e0820772725f8d5d41b82df66f8ffc715
font_01_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 11060 bytes
SHA-256: 9c8d4c530701b8f6cac443bef6a489baccb2ca0f020ccfa1af7e1688d4c0e44a