Malicious PDF — malware analysis report

Static analysis result for SHA-256 909a73207482a210…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 01:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 645e35810447df74124f6e6c401fe511 SHA-1: dc6f7d9fa6e469e34e18cbebf8ee3e0ca1d769bf SHA-256: 909a73207482a210f50ca36e9794b4f31b086798630ccb226a23abd8e4c25cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous domains, including compromised WordPress sites and disposable hosting, suggesting it is used to redirect users to phishing or malware download sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=resume+mail+subject PDF link annotation
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/wababufo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9e04a123407673cae9886c1ffe27d84e/ziluvofigokumisax.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/pawuxodogajovasofim.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/84441668877.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/zemapigidamav.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kenitemivojupewofuloge.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/34172830694.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rd3vilk6q3v101klo3mcufgarb/zanopamakuwuzij.pdfIn PDF document text
    • http://zaiger.ru/img/file/40201988935.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/10177600998.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/pejilovomuribexadobin.pdfIn PDF document text
    • https://magerp.org/upload/files/11580137955.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/10523384272.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pebefun.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906230416503.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/bopeleliwir.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/79430322667.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a23ec548---gekaxajidovoxa.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/tosegorudopebasomomizub.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zafurafebirobitaso.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1ac5196b---51835396061.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/vakin.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/28048571453.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_off0000bd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 10484 bytes
SHA-256: 2a3063fdf221b972df761e502e900bc211f4bcc8b564ba99286715dbaf02d147
font_02_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16636 bytes
SHA-256: 4d55985a9071b3f5becb25ed9c7b422278587901811e22348e6ed3cf01f6a76d

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