Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f13a28ef5035a7d…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 06:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc83327c689f3f6aea3a4e7b056ccb01 SHA-1: 38efd2d04ca2d693bc2364aad5408be5392996a6 SHA-256: 3f13a28ef5035a7dec61647986b8d9dd38754a9af2b6473c5d5514c0c3e9659f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to compromised WordPress sites hosting PDF files. These links are likely intended to deliver phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15cb0df6d---39089719700.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160882906f0545---vagatuzatopaxiwifi.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094130094207---6504467367.pdf
    • http://technocom.pl/editor/file/27084512388.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9536137c098589c39077fba539089667/35484079819.pdf
    • http://taiwan-casters.com/userfiles/file/82812402938.pdf
    • http://valsadindustries.com/userfiles/file/32232442339.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0802466b806e84fca901f306e6b02e80/81829102726.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/badetona.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/l7o9cj6omc89aenu3sthi7vn4h/wobobojeki.pdf
    • http://asupuro.com/user_data/image//file/sikiw.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b6f23d85f---6240024633.pdf
    • https://iqmuseum.mn/uploads/files/40366635022.pdf
    • http://koszyczarek.pl/userfiles/file/kizafedepebototimuvitebo.pdf
    • https://organicfertilizerproduction.com/d/files/68845979949.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/limilixitodilal.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d70fe84b6d---jurotijada.pdf
    • https://htddienstverlening.nl/userfiles/file/jirive.pdf
    • http://www.armstrongre.com/files/files/nisibikuverurirowukevu.pdf
    • http://cohensevents.com/clients/74638/File/75869900954.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cdb9e9b84878c70c2e0add1e82cc59ca/jigewusudozerosisug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=natural+gas+downstream
    • 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_off0000f81f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 16792 bytes
font_01_sfnt_off00011036.bin
503daf355a97729783b05728182a6247932127e37a82982c197bc7b71818b88a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 10664 bytes
font_02_sfnt_off00012888.bin
7e632080d47858cc2c82d29e455cff42b7824a5f237c0900921158f4d2825c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 17208 bytes