Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d939ef42f464fb5…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 20:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a83eac256ada8fdb2e54db308475c11 SHA-1: 2e84692750ddf5a8ee075ad5737d1bbaaf70cae3 SHA-256: 6d939ef42f464fb5fa8882e94cb13f8edac600a84af3ba8fc0560a6d06ac389c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's file upload directory. These links appear to be part of a link farm designed to obscure the ultimate destination, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098ec147a719---gedegumutuje.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7146d5834---naminiwazefelen.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d95f67b21---tilaxobijasovavadewunit.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abf37b5f40d---3354475345.pdf
    • http://omgmediatank.com/userfiles/files/fidarolarukes.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/92031214956.pdf
    • http://palaciodelosnavas.com/userfiles/file/gokujenozafekipo.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/301e955ce8a04a60e06bb1b9535cedf6/lesure.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/72hldeb9erc4ovfu0q4062nk7v/57704408318.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cdce70870---sixexatizipazoduvunelid.pdf
    • http://hainescentreasia.com/images/file/kezimuzozekup.pdf
    • http://standardamulet.com/files/files/61165071046.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/86ood7imse0qotfd4h1ieokde6/17043277586.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/321235f623c6b7ef1c52120e17229f8d/pefatu.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/df5a46c3e2a4bd0fde11dfbeef008d70/nevakam.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f8b82856d---zinixonum.pdf
    • http://axiomestates.com/userfiles/file/26954480236.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65a9d11a---87315763009.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e3737aba---midusadexivefokavodudozim.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e4e31c34cec2b5f731db8ac036ad8c99/81310604973.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ci4njpk98013usaflh3ts8uc96/67132152258.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb3068a417---xatomofapevusibeno.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3bh8mp8h4k7hdjd3i6lddu8gi0/ninamuperimigiridarajamex.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sbe491srhp68614qjsuefjj9ep/7867032589.pdf
    • http://daydreamspin.com/userfiles/file/95349301071.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/wevivupuxomalu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=2016+kpss+matematik+sorulari+ve+%C3%A7%C3%B6z%C3%BCmleri
    • 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_off0000ea1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 16792 bytes
font_01_sfnt_off0001022f.bin
9c31ae64f3caa2fa9421607e849e340f1433378cc356a90bf1ca12c2f88553c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 20264 bytes
font_02_sfnt_off00013332.bin
90fe13f206faef40aa71cae556705c650663b5518e9ccbf0c878c36fd5410dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 11596 bytes