Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dee3ef014fddc9…

MALICIOUS

PDF

90.6 KB Created: 2021-08-05 09:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9575d6a62874474bed0db748d723a1f9 SHA-1: 44081cb662b618391b1c24f09ea781648d7c8777 SHA-256: 82dee3ef014fddc91be3cb06044bc8880ab748c0ec17e32f84cd7f1399c141f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly imply a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=transformers+3+full+movie+in+hindi+480p+download+filmyzilla PDF link annotation
    • http://rauvuonsach.net/images/uploads/files/38954003699.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210725_7F4E1B6CEBBD47B6.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/95770803969.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/41036226148.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cc965535d94---tupuzenusam.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5c23bc55701fd2ac948e2dd26085ee5e/6815592510.pdfIn PDF document text
    • http://beiks.info/public/file/jebik.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/xozomalelufilotap.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b64fe68a304a5b21eaf9d9236fcdb421/28059429593.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c768e5b8---tanejavoxojitaziraju.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e34243b17---tolujazodoji.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o5t37gqe7uo2hgajuvcbkopuq1/vodupokog.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/885e529e30c4b85ede2329783cbc1d58/50291020029.pdfIn PDF document text
    • http://mosjob.ru/images/file/gekig.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/19634719552.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0bea43ed---givivedoxuvugubopaf.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a054482b205---potokisiragelofipuwoz.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/62091318629.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/belafej.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/713da6177b58a80f6e51c22ab0764330/fomafujufedow.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/ab250216ec2aa2df1590117b4a94edeb/jakabafowumuwebebamutu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/pobafosinim.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/foludatejuwanixosoro.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/gepumatimilojulibowabisa.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_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 16776 bytes
SHA-256: 563357e91e28e4746770d709c587178ff1e1e851e68c936e96ad07f70e365f40
font_02_sfnt_off00013f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F20 11632 bytes
SHA-256: 47adbbc3e164601e86109b58a6e6c677653af13d17f498f8dc89c39134371a6b