Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43844089fb8a8d7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 02:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f94cd5c380b1769bd855fb2ce3136167 SHA-1: a8f0b4cdd6a24e06cb4285b5b9e02a38a12c07f3 SHA-256: a43844089fb8a8d740610ccc3f17752c3b9506f7f34a8018bd26e93568da1aba
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d6fa3db48e858688882bd96650ed727/lewokakabikejesazoka.pdf In PDF document text
    • http://gs-metals.com/filespath/files/20210905185954.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/mokotebafil.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/nejejufurowi.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/3411093151.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210909102501.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/kixuvipapedozuwi.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/sapupebuvumanofog.pdfIn PDF document text
    • https://actorconseil.com/files/file/bogopuse.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/juxenigutudokumemejuperip.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/34606483523.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b679254fcc55f710922d1b4dae7aecae/biselafunajuwib.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613422020bbb9---daxuwiwepisusibofitenizi.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210906032002.pdfIn PDF document text
    • https://2winit.com/Files/files/mekebobuwunarizipe.pdfIn PDF document text
    • http://budropol.de/Upload/file/xukaselezofesenozebaroved.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kopim.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/29204043961.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bojakededib.pdfIn PDF document text
    • https://papiratisk.cz/soubory/12040848392.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/rapiwevozakerux.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/68667590568.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2568795fb---dupavodozonovafuxowenoj.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/73577420774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tamilyogi+justice+leaguePDF 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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 10676 bytes
SHA-256: 909ab875b6a61ee90bae63b8d87ce5d27c50d84838ec3b8ab3e043fce55d9b28
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16676 bytes
SHA-256: b3982392ac0eafd75112d9d5bf48c1ca89a8703b7255b79370b33fc9d00345cc
font_02_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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