Malicious PDF — malware analysis report

Static analysis result for SHA-256 432f9e734d6c1c6e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 02:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f687e6cc03bf790351a47ac2f8acb2f SHA-1: 954f1843c9a37b2aa3bb54c1f7808a462e5877e9 SHA-256: 432f9e734d6c1c6e96b99caa159190edf22b41436e3f6a072e2092c978124193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links point towards an attempt to exploit users by directing them to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=was+were+reading+comprehension+pdf PDF link annotation
    • https://parlagame.net/calisma2/files/uploads/43470204039.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/18329131395.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/dalebazitetelisemo.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kunukigelumevekef.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/vuvefaduloj.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimirexiwezov.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907105800_so3g67.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/dilarefugepafomodoposebek.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/vifoze.pdfIn PDF document text
    • https://gencatakan.com/upload/file/pufadodivafokonajezagezi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3b8ea4bd---jolusawupilawew.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/tepija.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bbbdf9fae194c04bf9bafc9afe75b902/56451781252.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/63364939010.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631945540.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd9b220b7---79853395414.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/jagelewajuzisidejim.pdfIn PDF document text
    • http://yoron.net/up/files/zulopesedujibizagejubixe.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/47363821273.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/mokidaw.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631109423.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/22665867844.pdfIn PDF document text
    • https://italvaping.com/file/faputaxejilekorokej.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ph6ah16cd6rm29ngvnse1n4sl2/69213198582.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 11004 bytes
SHA-256: dae0f540979527cafe10c6efed25b9a896e7cfd919244d152ae47009a33d00cd
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 16580 bytes
SHA-256: b5e7674ef324168f141e259c8e75fcc99826cf7572ee11f28b30005e70eca248