Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e021b90dd7f8774…

MALICIOUS

PDF

75.6 KB Created: 2021-08-07 16:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0fd24eae24d531faf996fdcb72f1cc98 SHA-1: fa41de21cfb7503a316db0ad3ec2e5168d90e31a SHA-256: 9e021b90dd7f877420ef04bfc200f4d896c5e20442d143fbdafceaaa392b3874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807c5c09be2---35685532618.pdf In PDF document text
    • http://sequirk.ie/userfiles/file/85456602191.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0aeddea3---vajidakovuvobil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b400010e2---zunaxafoseziditef.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/31067560363.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1df0f284---koboga.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/kugupotezaposidekuruwari.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1f0dc7c3---1571492292.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/baec0e8738da98f95e24143267ae220c/dekifupilebujojadusujepo.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624021704.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/90404164319.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/86454296110.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/wofulojumaxagijujaza.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/vijubavenuxama.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4cc938e126ab14ed6917d49043318013/tuvujukedobuw.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/p1eifraen97n7gldf0udbp5tub/jonuvokalivejomesurozi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ea3fb6f7639a2a4ed7eb136e1235dc85/8435303609.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/sowejoburutupafosunadoner.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mac0cievfsj6p06et8ek1pb7p6/91181742596.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9nk65ei9886a7igdt51lk99ag3/44403576076.pdfIn PDF document text
    • http://brianhigbielaw.com/UserFiles/file/94683002273.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6a84eed2e38252e0c4a3442fdff75ef9/vokoramopafaponipune.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202183124751046.pdfIn PDF document text
    • https://wagaskar.com/media/84829091798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sweet+dreams+marilyn+manson+mp3+free+downloadPDF link annotation
    • 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_off0000c1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D6 17388 bytes
SHA-256: 5f162141fcb10639d17600903dcb2bba52216ddc2504003823d4e15a15227fa5
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 11104 bytes
SHA-256: 278b1a056f4214f7e922cb8d11c6b6fc695f6bc20640f31a287c9074908a50b1
font_02_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1