Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9379f647ddacfa8…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 06:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ff12ac303275d746e4b4a2645d338b4 SHA-1: 3c5153fe50cfd4d90f99bc9a73aeccb72274498a SHA-256: f9379f647ddacfa8ea6e3cafadbc842db1396b23fa77aec2044a1b828a1e5079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to exploit user trust by redirecting them to malicious content.

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 http://szyldkj.com/luodan/images/userfiles/file/63195630195.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v48abm5bct41m4np5qm4dd2ak5/13967773648.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5745b86a67---28069231135.pdf
    • http://physocare.com/Images_upload/files/24467473088.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/18b2da12e602f4d6ea44ccc68c357d53/41068355258.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/oivng9raa80c977topl2p9rp87/12256220382.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8caf5a190a---27038691044.pdf
    • http://aaaexpressheating.com/userfiles/file/11914131344.pdf
    • http://asupuro.com/upload/save_image/files/54723376912.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4b75d9db0---11200377723.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7s6j216tvtpd8nrdj83g1ok9h1/50166614353.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a10a7715d62e67c92225e11c23a83dc/33703273069.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3a10a5fd2a0081f13205071ec493eec3/xalukurikufuliwisijidiri.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/78530384554.pdf
    • https://bandai-k.com/userfiles/file/mutozajaga.pdf
    • https://etonbio.com/newsLetters/images/file/batujomaxedu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35c7343be---wenuwuguzutelasojimi.pdf
    • http://alliusie.com/userfiles/file/pubutovidipesotun.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717e41e3dd4---41171308394.pdf
    • http://adhdesign.de/userContent/files/20210611114514-ruxafetevur.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e5a24f26---wawurejotefogesina.pdf
    • https://relans-nn.ru/images/docs/file/95381177405.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+college+for+physical+therapy
    • 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_off0000e44c.bin
ba58bd32194009065a283b8d500da1b0f10a24833416842f5983d49d2082b6ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 16944 bytes
font_01_sfnt_off0001102c.bin
c1c7872fe9942307ba0f5258f6191d93ec758b93a42acf533203fe3da5045b66
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 10820 bytes
font_02_sfnt_off00012956.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 16792 bytes