Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7852df97873349…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 09:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00ad7b8db057a92f5ca586b5cd157adc SHA-1: bdfadaeb977c59c5e29317ad667de6c76e36c4ed SHA-256: de7852df978733497ad9e91499fb248ae796fc04cbe33ac5a43227017ae22679
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=crazyhead+have+love+will+travel
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1082e59b080b9cd8fb17579dd4aa09ee/zabivajefixu.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41bcd7ca8---69375784889.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da147a78b4---nulimekosajoba.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756979e3990---8029661945.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/vibumavudomimosil.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ebb6b2e55d77a78c9d5ad81b60cda851/15157368270.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780f5871541---41696264932.pdf
    • https://artlabjo.com/userfiles/file/21278977630.pdf
    • http://skolicka.eu/foto/images/file/ropemekesakemunovejateviv.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c5863cb1---tolet.pdf
    • http://teechart.com/uploads/images/files/69838088517.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37d365600---wadadupasixura.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/76381946780.pdf
    • https://go2germany.ru/files/file/94713629821.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ab659f9be---36627819964.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609de1afe34b7---36789162077.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843a569285---xisemopivefavegubinadem.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ot56bqqi6m4mav6nv18jjv3ul0/wejibizitatel.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8c95a20b---68044326857.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/20e8c3ef71b53f893ff4c8858947b437/76746923824.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pl3trqtgocve4f7022vvle6oua/mizirogit.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818d2687b21---87471896004.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608207c9b84f2---pixavijuwozupusojagu.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fpm58b2lfbho3kiu4l7m629orr/gizigilunik.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf3b1d4ee---jukogop.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_off0000fbe2.bin
b09d729ff4db3dcb0c8e53de819d06fa0778fab30ee87276456654637d946610
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 17676 bytes
font_01_sfnt_off000129d6.bin
75d8d5f83f4b745e3b4413211d475d9c6205d83592681d79bfc71d714943be90
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 10432 bytes
font_02_sfnt_off000141b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B9 16792 bytes