Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c11dc5756c41b0a…

MALICIOUS

PDF

79.9 KB Created: 2021-07-18 09:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: da5fceb425056804725b41e84536930b SHA-1: e0338831a50f8bee998afd2024eb74eb6f8cc33b SHA-256: 3c11dc5756c41b0a4e31ed83022fdc38a389a03acd3e9f6fc28dee3e4f7e4019
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c53e4e50a55099ae324db42fb6d0f215/90093484926.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16090820c5b870---kuwurogewegajovisejokad.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/dekabefatiwetofilepuri.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0ebea7cd---pivawejuwot.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a1524d5bb818663ae1c7bff31d0ecdc1/sokino.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kimonopem.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/elpcieg6lqp4j46rq2qvv2db71/89345392559.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3gcdq4i4k18pv7t17srlg8h8cr/479620765.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/tajuvupenadileluwo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b61e394ba7---44398871355.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c7880d2f08221c4ffc0d6f6f3cbc0757/lixiruzijotoxupineze.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/wopesul.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aeak82svft3uarf3lau0klvbs6/wolobaruwexajekogepefuse.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522131939246.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/46514183190.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086da0567779---61076886784.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0775d9605a6ab979c9cee5e7f19f7c6a/42302891913.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/37271335853.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/14vd6l9mftjblfban4ulpggbhk/52398735821.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xujed.pdfIn PDF document text
    • http://fittbike.hu/files/file/18989387011.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/zuvomoridetezudedanadozo.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/97433043596.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/meladowelamen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=35+m2+to+ft2PDF 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_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 9900 bytes
SHA-256: bfc15472662814a89a54187f54c884676858e6725735d0c386dc67283bf56ec4
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 17184 bytes
SHA-256: 747c61c8a21b341d5a85ff8b5d9a7d95fb9d102bf452f9675989412ac40c6463
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1