Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aede51db2ac58c…

MALICIOUS

PDF

82.7 KB Created: 2021-06-27 09:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 394b268d9d97e07bacf177a0ec674a34 SHA-1: 29fa6ee6756690a099b33ec3c845d3ba12f5fc1e SHA-256: e8aede51db2ac58c2ee2d73652e74e3658b331740d1f12a386edf2ec8bb5797d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=how+do+i+set+up+airprint+on+my+ipad
    • http://xboxheerlen.nl/userfiles/file/65928504131.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6e5e28f8---15005344741.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kpjcj5ua4178522ss2mccag8mf/buwisoparu.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/jevoxu.pdf
    • https://aonetreks.com/uploads/file/guzixevoseji.pdf
    • http://strandedtattoo.net/file/25488946999.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9uqauve4evpu2644iui23897j3/33397554295.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f794c8e549666ec2a5f3b2b83cf100cc/kebefujozokidugiju.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c5f4e9bfc50---wagawebowa.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/s67va4jrta3nab3bvpaepn2spk/22950441401.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/21d35a8010bb712005ffe6031619af4a/vawaginizomewimozonakuson.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f277e6f6d4---83980516675.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c44b30a7c7---5626477104.pdf
    • https://juhaszautovill.hu/userfiles/file/fipevepuzunevunovojiza.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b9ad0126a---64676880496.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3278c88e72---fekidefabakalupapadutu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ebb2ec793fdde5033b8f847ae5433123/fosikibonupikubujodudud.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/895e094705393329197b799dea62e207/25412575397.pdf
    • http://on-video.com/movies/movie_data/file/18754422283.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e064.bin
b7034460a21398a30f18ab30eeb5d4d4fae709ea97b3668b6af2c0792fa0ccbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10796 bytes
font_01_sfnt_off0000f94f.bin
68cf636e3eb044a6ddeea16691e9d9d717616934577d93db382ccf48af3ffc14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 17052 bytes
font_02_sfnt_off000125d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 16792 bytes