Malicious PDF — malware analysis report

Static analysis result for SHA-256 60428c41e4596fa8…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 01:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efbe9d82f0ea4a6bcad3e15582c3673d SHA-1: d037899d8647e6943e17d7a7d4db7c7dff197432 SHA-256: 60428c41e4596fa8ff4c56c367848eff196a30143ddfe187d357b26e2f861474
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of external URIs and link farm characteristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jenan.com/ckfinder/userfiles/files/39095119872.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707da29ed16---dukananofawabefebu.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-23/20210623184400793064.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200860f3f7---40840080467.pdf
    • http://dienmaythanglong.org/uploads/files/17167787971.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e99998ad---53780527570.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bca7b1abd---68623874760.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f6c42af4c---26600763729.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b1b1b4c1---lagedobopowojaraj.pdf
    • https://birudongker.com/contents//files/nijefijevut.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/fobomedowofafatefil.pdf
    • http://bi-acaovo.com/upload/files/xodasizasajiwukapuso.pdf
    • http://hoanhaochemical.com/uploads/files/xaresemivisarotunug.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/92380699618.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2rcqvkrqsncgmq9ekr0hjs4kj/49912241391.pdf
    • https://bamfieldrental.com/userfiles/file/53168926144.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kbgs4bnorcoobi1scvpm92f20d/zejexexovuk.pdf
    • http://goldmustang.com/files/files/tiwofaxeberedox.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b893b18cf---97633507697.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lotajodusogeb.pdf
    • https://doktor-ara.com/userfiles/files/duvuxexunarejatemo.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fd49ec5c---33446468068.pdf
    • https://ckmandarin.com/uploads/siribeb.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2947a1a0fbbe3a2ed754959432b02a41/jupovesuwusuje.pdf
    • http://asckhn.com/acskhn/userfiles/file/genewukam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=artificial+neural+network+modelling+pdf
    • 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_off0000c384.bin
16a4f432d92617fa4087e4f1d3e0fae9bc0fdcb3a2061f1b7ad7b1584d8adb81
pdf-font-stream PDF embedded font (sfnt) at offset 0xC384 11056 bytes
font_01_sfnt_off0000dd1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16792 bytes
font_02_sfnt_off0000f52c.bin
93f007383c0d52903192f289ccf4e4dd50d43552094255785d32c234410aaf64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 17716 bytes