Malicious PDF — malware analysis report

Static analysis result for SHA-256 4748d43e4d7df05f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 12:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e5677a768d5dcb3d8254fd1f01809b5 SHA-1: 2d255970965b680a043f4273bd9742b538e8941c SHA-256: 4748d43e4d7df05fcf46e42e63272e6ac37afcb0d7bc3a29746f2f69034f74bc
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 websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://princeworldwide.com/multimedia/userfiles/file/77703308051.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4ee32de6e549ef861e5c44267e798360/84897370209.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/werezododusokef.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06569b8fb---wufedavegewesojo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/a8d5vf2e3gsc9mvpmhk4mnff97/fililujax.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/54636173510.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/rufalizosekesatilalulizaw.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bd286409a569c46809d63ea49f9070b/646552659.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/91144295893.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/gutugajewusajebadib.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd06121c919---65441186633.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625733398.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97e0ab061---pasobam.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/901b68369d63fe7eaf987936da6bbf78/jototemunabazu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/woxos.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7c39056162077d260ef8c3ee267bac61/8772548647.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/8113108221.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fff91e0b9ae---jerisikinesikov.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/duluk.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/belodapanozowusi.pdfIn PDF document text
    • http://neteyes.eu/editor_up/jujiduwatipozenopupuwej.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/gunuwe.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/lo9l0j1ji756789uhlvc4p9rov/dowapupumiguvuzope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=beginning+spanish+conversation+worksheetsPDF 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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 18332 bytes
SHA-256: 4c55e7d9e2e2aab1348cec643b1e9f146238842a369a67bedd8ea1966d7bc603
font_01_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 10904 bytes
SHA-256: 81ffc3f96d44a92c9b7843c4ac5d82b0ee11c482a6f6e681240f455b65f8587b
font_02_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1