Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b905f6b149cc33…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 11:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60d4898f14bf3a67501fba94b2282e5c SHA-1: d4519e49191290816c57c2269e912d58cd0a915d SHA-256: b9b905f6b149cc33d5ff4e53ff855b09c71129e74803d5d791f12c5c3d7c0ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, with some links hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO poisoning. Although no scripts were directly extracted, the structure and heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://erh-hu.com/userfiles/file/82317498394.pdf In PDF document text
    • http://conomiya.com/images/uploadedimages/file/73516238303.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/27859897268.pdfIn PDF document text
    • http://freeorden.com/media/file/40418211456.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/39818710919.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/zovosafa.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/voxenudobajasiwebenaxeri.pdfIn PDF document text
    • http://archbot.pl/files/file/getodipapowibunotazona.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/36070705175.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/najawojeluzimipo.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/85081696252.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/35911951117.pdfIn PDF document text
    • http://unityproductions.com/upload/files/9504506413.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/806629b6b626da2b625bc84a1996e162/lugusotikobolekugovazo.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/13021921471.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/23001726532.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/wibukafalelepekuruxugugu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9b82d43a---wimalufesonopobabosifik.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85435124948.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/varoli.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/tixed.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/najuzudo.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/29142684926.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594cbf05bf---bexagubaxapulemixewem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=verbs+that+start+with+zPDF 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_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10188 bytes
SHA-256: 40fff34dedd3e3df5f0774643358186a2eced405e87f658734b0865caef1465c
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 18824 bytes
SHA-256: 8fa61d2a54343f8d6db786ae83c96d33734d53a454389ddd4ae3dffe902a6740
font_02_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.