Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12e7df412bcab13…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 08:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecfd2f3a8c591df865eb8630906f1666 SHA-1: 811655c02fcd094ea14f8a65f4232e9bb67d8b80 SHA-256: f12e7df412bcab134dff277b6676f104153a214bf0a8a4c91553928c3dfbf78c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or other potentially malicious domains, functioning as a link farm. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88aeb57nbjje4m28cmp95lm4v/sezizudedonivisupi.pdf In PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/dimabixoga.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8696f908---divosi.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gapifu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610a545c98218---berazowizaxopiwujagix.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6sgdl5hbhbd5jam1nrpacfe5fr/8290897226.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e049a0e11da00a99f548036b8ab768e7/wozewamu.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/jaziz.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/nobilovebopokax.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/14cd9169f072d2dd09de2b776ad49b67/86893800697.pdfIn PDF document text
    • https://aokman-drive.com/d/files/78555712031.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/8181173483.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d24brb0uiql4floov94gp9lfj3/60943758161.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/lozaboxoroguzulopenadijo.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/semumezafisekaponikat.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9d974d87---73166348990.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/mifakinugirinutovixali.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb7cf21a9---79710376466.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c83256bd---basofame.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/38fb373e5c14fc3ad12ecc9589e32f6b/nipufusinal.pdfIn PDF document text
    • https://sanagustin.cl/files/zefojukor.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/05ehtbjj78o02lv7em5s79mu0g/puwadawemakonokiro.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7fcd163c---58410175617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=agreement+of+sale+form+pdfPDF 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_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 10732 bytes
SHA-256: 8e4df243b9850d55bd44894cd9084f5fc72a29201a539ccb9cd038c9590e4c62
font_02_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 17276 bytes
SHA-256: 3d81e379c5989ea8af9beab18869e4f3e69da615b3682e6e7a4dc8178d24feb5

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