Malicious PDF — malware analysis report

Static analysis result for SHA-256 084769873ea22020…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 03:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccaa04438706601a66010c04d40588c5 SHA-1: 95d508eb5530b43ed38624307c457ab3985b79f3 SHA-256: 084769873ea220208dd86d607cecadd65ee9ee4c69e03278ebba308f5d0ef298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, redirecting users to various disposable domains and compromised WordPress uploads, likely for phishing or scam purposes. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=android+3do+emulator
    • http://aj-freight.com/ckfinder/userfiles/files/donesiro.pdf
    • http://rc-modeller.se/images/file///xiduxadezufosize.pdf
    • http://gtlitalia.com/userfiles/files/zanodowut.pdf
    • http://gpszone.hu/upload/userfiles/file/dosabasapexagelimezado.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393a0d59e18---9051016891.pdf
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/75683570320.pdf
    • http://martonaroniskola.net/userfiles/file/tajuxipamadogiwamigibej.pdf
    • http://hmed.vn/upload/files/segofivakuxenopakolimowe.pdf
    • http://merydian.pl/nowymerydian/userfiles/file/39812031158.pdf
    • https://ymy-tea.tw/upload/files/83464086019.pdf
    • http://samnakthodrahassob.com/userfiles/file/vepak.pdf
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/44683933084.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/88899620460.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/lelotove.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdcb89dd4---lujutipazaf.pdf
    • http://beerskiboot.de/img/upload/file/zuvav.pdf
    • http://ebd.su/UFD/7623/files/21623743480.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cc049a85---fisaxe.pdf
    • http://mariancozma.com/_user/file/wofofudikutazigidawejuxu.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/16073528044.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f90dabca6---44051949233.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zubumugubulixorijil.pdf
    • https://omegaplus.bg/uploads/pages/files/linajifaj.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_off0000e781.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 16792 bytes
font_01_sfnt_off0000ff93.bin
7828ab85f76a530f2646a5db793571426e48bca7dd2d7babdaec52d89948935d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 20376 bytes
font_02_sfnt_off00013457.bin
2fad88fc29ec41e9911ca44f39cfb54150b1d6ac88be82874e15a413c04a76aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 10492 bytes

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