Malicious PDF — malware analysis report

Static analysis result for SHA-256 233316fbbc9dc3ce…

MALICIOUS

PDF

100.6 KB Created: 2021-06-29 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95bfd0022faf2a9df66258803afa98f3 SHA-1: da1fc151174b507df8886990b0950b8d63102ed1 SHA-256: 233316fbbc9dc3ce094a80abda55baee01e3649e0193c1760ce8434b5827c4fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://tsafar.ir/basefile/tsafarir/files/82216623554.pdf
    • https://2acontractor.it/images/file/70283070669.pdf
    • http://adveotec.com/img/file/39850229560.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f982b88c82bdd095a3deeaeff8c2d1ee/17514389338.pdf
    • http://vhktn.at/images/content/files/fujewixiduku.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ba9e4d3---779672255.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wibojakatezetowumulikegaz.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c12ea50c4---wenukoseza.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ecq58fj8n3qa14si32461i4plh/rujizuwupaxo.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/176d18b703444fdd1a9a9bb606956a4d/85244362073.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7a0e60882---59975878985.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/84024938133.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69cb55d7b---33247529025.pdf
    • https://bobecoingatlan.com/uploads/editor/file/22071691409.pdf
    • https://actaviaserica.org/board/file/files/lofujem.pdf
    • http://asupuro.com/upload/save_image/files/91335786244.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67f4db32f---febudupizi.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e7f61eb9---43809417042.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/88d91db8d38a8509dfbc9216a691eb8a/33287662925.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d6b60c40---kerodukodabipi.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff770c28b4---32936316844.pdf
    • http://fructusartis.com/i/File/92356407776.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608293fc1d44d---bolixijinego.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee446ac0---durutavaretopujowekejuta.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+languages+are+learned+4th+edition+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_off00012396.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
font_01_sfnt_off00013ba8.bin
64e4f79ebae0f6d59a1a3b7df0106064659dab173b04c68ca372d81cd42fbc08
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 18396 bytes
font_02_sfnt_off00016b5a.bin
a92a84b69fc89a2902fd5a487e2d5885491397f11ea838a18e7e39a25f75829f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5A 11032 bytes