Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfd0bc982ef437e…

MALICIOUS

PDF

83.5 KB Created: 2021-06-29 01:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a85a064c78b55473f8b1429db65b64b SHA-1: a8c93617cd9bb420170fefa58ea61a0690b8d7bd SHA-256: 8dfd0bc982ef437edaaa7808e451668dbc3f3b1d38ca67b5f671458665e4c8ad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially track user engagement with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=past+modals+reading+comprehension
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/5ufc22regn9u1i05g2ti81i14n/16825442106.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/posivunujemokowekeguwaj.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160826b4a835c7---tuxofelalipedadut.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b40c8c41d2f---vobapazibis.pdf
    • http://abwva.com/uploads/files/vakixasokozafipa.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16095f97e9fe47---97476080056.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6e767546---42556958362.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160825216f1ba0---87261893290.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/192922841260da483b30c4d.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe721c1c4---riworufupuvi.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/05ffde8c8b78ea3a41c13569ea46040c/51079866206.pdf
    • https://etonbio.com/newsLetters/images/file/dijogikab.pdf
    • http://npas.ru/pic/file/ginikijimojesemol.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/59766175f0a33e0793f94fabf6a062a9/44883185983.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c60e5d24863be5cfaa3df1069082f38a/79465588878.pdf
    • https://dialogueinpraxis.net/files/docs/rezotefumubojiliser.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8b83ef7754b511d3436298674e126696/74581044499.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084372d75758---66504875812.pdf
    • http://ottotech.center/userfiles/file/wowupufos.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5008bb9a6f8c5711ec80020c68d8e6d8/bujufetoxotoxojuronuxoraf.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/upnc4r1g0aj8mqmgetgdomhrdg/fikofi.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/56709190684.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_off0000e2a8.bin
aa6b11b4d0f0f15e76c9086d4017023b9b78369532348d7f0f6cbfc536db62e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 17284 bytes
font_01_sfnt_off00010fa7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
font_02_sfnt_off000127be.bin
29787f11afe239496ff4523c7887436bff2b260873b9ca377fbb6cb30b5c2e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 10964 bytes