Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dae83ef9df8bbd…

MALICIOUS

PDF

85.6 KB Created: 2021-07-14 02:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24ab73dcd4779ae4e03015ad9b2b706d SHA-1: a4de963814431551dd6eddcc4d656c8de8631a61 SHA-256: b8dae83ef9df8bbd4d84dc9f4e80cf54cf94984e14f58ce591a717321310db46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=oryx+and+crake+chapter+7+summary PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa19b11d8---76062559189.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/sojozirelarevefugorabugez.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/fetasares.pdfIn PDF document text
    • https://ancoraeducacion.com/images/rabagex.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/394ab5a31f8769789e503ee7490599bc/9480828927.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee687f669---20418781569.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9b69aa57eb4e746105e6860b59fcd673/modewubotesutudi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/hhhnr1b0r89q098sbt31295v2l/gusikulowibuxet.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6326c0dd82---riviburebufefoxewuxag.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/60821500378.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/28415065038.pdfIn PDF document text
    • http://riceart.ir/basefile/files/16684796905.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/52165469425.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/netojigosawopovu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/980489c9f50605172fa56027b4d2aadb/17937668168.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/fapesanokamexekebu.pdfIn PDF document text
    • https://t2sc.me/userfiles/81534410731.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163777ad2f---45617146938.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/27826263221.pdfIn PDF document text
    • http://fructusartis.com/i/File/suwata.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vajezufabofokevewusowaku.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/zilikudujedin.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e1qta606qg40i3s02eipshl590/zivozuboxa.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d28025b3919---23146855249.pdfIn PDF document text
    • 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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 11004 bytes
SHA-256: 75bd5353701d1770c2698664475b57e079bf0cbad2e6fc36b7926e5388d4b2ed
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 17912 bytes
SHA-256: 54ec99974c3385521aad256e5d8e1a83cc293cbfef59e5f1855cea930f0ce469
font_02_sfnt_off000130fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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