Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cddb0cc34020498…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 20:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d49ffbc613c9b1164e8e38702efeca65 SHA-1: 460aa3b9a2950c057ddacaf4f7e2642edc0a19ee SHA-256: 8cddb0cc340204980848b9d34079a86b343d23e637fdd81d383de93951053162
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fluffy-chins.com/images/file/mijijezugefukadedarejix.pdf In PDF document text
    • http://sinice-rasy.cz/files/file/bobedepafomupeje.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/meniwewapowukodazoliro.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/86331661873.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/tojemulugib.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7d4ff34f7d3db74758e482297ff2643e/limuxegimi.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/toxolatokasinosezoriton.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/matipalezukemusapeg.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/bolemulumazaritukabugo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f55b9bb92288e78c449148f14f7cc068/7521437649.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///bopexawumokokezade.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/telomivedowovogaru.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/vojapupi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c910206b74---18377348859.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bdc6511f---suvesositararurufafujuku.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/ropabudamopudumawetalakem.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xomidumig.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/55838800342.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/58143780184.pdfIn PDF document text
    • https://123natura.com/stockages/files/40550193530.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/rupitukemenuloziz.pdfIn PDF document text
    • http://btfa.tw/upload/files/34306462925.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/gevibonikakavitojaw.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/xijekoguwovipoxipa.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/sibaxefegikesugikep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+dragon+ball+heroes+gamePDF 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_off0000b4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A1 10732 bytes
SHA-256: 9aa356b3ae17c888a9a8bbfec3020621c967744d7e6cd52893babef1cf40ea29
font_01_sfnt_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 14536 bytes
SHA-256: 9ab0dab6aa90d9cb4364f750afa230b461ef5a7239116b5a952e58ae0f576b60
font_02_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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