Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f031c2ea4a605a…

MALICIOUS

PDF

127.9 KB Created: 2021-06-28 22:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83e8fad3d8c4a83d4087bd1d6f979eba SHA-1: f5bb26e02bdaee46720d7638a2a0a3847f444711 SHA-256: c3f031c2ea4a605a7af25b6224f0ed89b15d9d913de8906a18d88b80497bffdb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF or other files. This pattern suggests the PDF is used as a lure to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d960e90cf3c04cc45d2e5f051baeef8b/73686099088.pdf
    • https://ceral.pl/ceral/pliki/file/18259824886.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a84946d5b52---nuzukivisolujav.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ruptst7pjif4o3q03m471o1md/94036442064.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf986151628---3581316070.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160af91b7a8eb8---gosisulezigufajazet.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b04a3c9afc47538850ba7901a02a74bb/66258656329.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf71c9693---jiwep.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fonakaglgfo09i7oviu5kj6g4c/xokugowiv.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/68105370764.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cec03bc---vazezipate.pdf
    • http://argol-editions.fr/userfiles/file/83573461756.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077467383caf---96224488561.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a197d85b6cd---47077480060.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe4dfqp6l9ih0nsv2oc0jcjvph/32434399964.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3aba6352---53376969191.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/aoegsfek4v07rvv9g5v6co6d77/11882341767.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/abb230a019588a1c4e1e5d4e6de4e7c6/goworadepiwararemokami.pdf
    • http://meble-tk.pl/userfiles/file/lixigazob.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volifonepof.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lj3nmmpk1u2uuvncp055gnncc4/26161247047.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2dd4ff1e2610d36e1d4915ab7d6b9c78/54055515567.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751715ba676---81505072202.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/38630445533.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/171928b56bb4342a8f1e3bfb90e8763b/jamulitifowunajoxom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+6+queens+of+england
    • 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_off000190d7.bin
0530624cbd9b7c60ca508bf4463d48a60b59822cb19a3f0f5c7c53b6db79b5e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x190D7 19056 bytes
font_01_sfnt_off0001c19e.bin
03ae5cd9fbe159cb3b5c7e76a383d212c89c3fa5c655c9fdafff8f4f5797de76
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C19E 10720 bytes
font_02_sfnt_off0001d9bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9BD 16792 bytes