Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c2a3f7fc13939e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-12 23:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16424f54eb7702e04838ad7b20c2c326 SHA-1: 2f10016457f6a37e9364925da6305f26b77aead3 SHA-256: b6c2a3f7fc13939eeb1e2df06e1d26fb0372501fbf5966aaadf4df2ecc520f97
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous links, many of which point to compromised WordPress installations or disposable hosting, suggesting it is used to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the download or redirection to the malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0323715c---68277813088.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/87463715262.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/dubigizetofonatupebax.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/powonigedumapojum.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/60498867684.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c464d4c22---xofezebexizelesele.pdf
    • https://communeouchamps.fr/userfiles/file/siwobul.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/da2004000122b5ac6445073f0a7a8505/zabawomefopomivaditosefof.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae442d355a3---fawumupogowemedaxana.pdf
    • http://barrospizzadb.com/uploads/files/7962081307.pdf
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/49079389584.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/7349567798.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086690dcec77---58062785868.pdf
    • http://risme.vn/files/32977182819.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/761ccb944435cd5e5bdc155a051e8b4c/vinitosuzumebovefunawo.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/02b7a99bed5b0481e26c9dddb1c7eae7/nutozaxowabakulatenas.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/k80mudn9gjccif8s3sle564j70/benonomapi.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c63f37afc---34236983620.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d44627adb66110ab492822d667166a5a/mubitomobonuligidezeluwet.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160779e8b14a94---ditazotarunodi.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2082f2032092a4904ab3565a05ec2855/65738934772.pdf
    • http://boeschfamilytravels.com/clients/43210/File/movibanuzaferizezidefa.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dd8345b3---titepavijekugopug.pdf
    • http://gialtour.it/themes/userfiles//files/lufaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=project+time+management+knowledge+area
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f166.bin
eaaa67e229d691bb01cd5dc196413fa345b7667ba785d8790719a5e23ec254bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 10856 bytes
font_01_sfnt_off00010a3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 16792 bytes
font_02_sfnt_off00012251.bin
087758a329e6f042582d74777f37fe586fd7fade73d77395b3080ed16cdcd5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 16728 bytes