Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bacb60e401d843…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a08a269db51885aef066efad0ffb8bef SHA-1: b1908515827bd246d609f50d1a77414bb3eca431 SHA-256: 63bacb60e401d8434cf4f0bd6319cba1464b98f4d26cadc6e528d33e8531031c
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many hosted on compromised CMS platforms, strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smobiil.eu/userfiles/files/30635995418.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e397f217a9---jegubizugegorafopas.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/6360584540.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/babixazapewif.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/79c893911d9591446d3dfea454536280/xavurafu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613951a15f50f---3656902667.pdfIn PDF document text
    • http://chamdure.com/DATA/files/zapisuzozatet.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/belowugop.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/50940284312.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/88741311538.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161341b711a771---poxezetezik.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/voxamajelukezo.pdfIn PDF document text
    • https://norservis.info/files/files/28198650165.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/11443790028.pdfIn PDF document text
    • http://baove24h.info/upload/files/4189659737.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/53382816474.pdfIn PDF document text
    • https://maviet.vn/upload/files/17824393495.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/pakipovizenapozewobatajif.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/dufonuxe.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/xovixozevo.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/tekop.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///25174011284.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/pimofujujevusipexamofelin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=roblox+robux+codes+redeemPDF 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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10464 bytes
SHA-256: 0afe525334f6a91b5a4ab4e4b4a1931e296c3a5216a3c01a31ebf499b3c09970
font_02_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 18128 bytes
SHA-256: 0873adb6b900f67a6bb5aa2be1ff294e3e3065cf69e613a5af667b8c69b1c8a4