Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df7f9c69ca2988…

MALICIOUS

PDF

84.5 KB Created: 2021-08-02 12:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f824382a782df94bc6d7ae00a7e85e9 SHA-1: fb985f995537d5fa75d15f13698d229391c2e572 SHA-256: a8df7f9c69ca2988a73af3b957e7fc4f4fbd5523bfc49b7446fca4c8231cae8f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or malware. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://pxmonastery.org/CKEdit/upload/files/munedepemokukinamuwin.pdf In PDF document text
    • https://firesystem.ro/imagini_ws/21990149451.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/sawusokinudirazi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c922517e906---71141180446.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/49969610013.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/vodatotuw.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ftknopkikk5q7m34poja1597h5/17961498613.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/zawesosofajik.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/906f8010c0a1a862dce9f9ce2583e5f9/fukizibinirigoxuk.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5efae14136---18165787536.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/47bf89a89c1983e1a2fb349032c2e74e/safizopepexoxarigito.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9fafa07eb5b5906c361360a1a9e783d7/27748014785.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b92c3fb81---nigopigoxisedikoter.pdfIn PDF document text
    • http://groupkaishan.com/d/files/62105942585.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/67252019469.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/tatodesi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffa39ac91---tisova.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16070a740e83d7---89551373328.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a482925da1aee56bda93427c6fb5b702/manilugodasewejige.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/872fe36e82c51df23f7f0b55e68826dc/5382709044.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/4905050315.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/jimadinidajeperoxoduk.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0ca8f06b---21715629404.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/lerajukoj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/popofedexotaro.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/27hjsf1vntjruafhbcctaj587g/73065612304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clinical+pharmacology+and+therapeutics+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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 18076 bytes
SHA-256: 025d6c528e597780f57d747e5eb6287faceb8609e67e4a73a827ebddc323c4dc
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 11312 bytes
SHA-256: 32c52fccc1296d9c72cf0e7edc45c1fd08eb6060b33b2d8d1ee029ee873fda57
font_02_sfnt_off00012b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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