Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fa9bc7f97440b7…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 01:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3deb95549cdb9d141d844b95bae5f1b SHA-1: 710523ac128812f3735fe62726fd2dec44bd3460 SHA-256: 89fa9bc7f97440b77bcf33100cd2c9c77c8cba160cdda0bf2b64af2adf9bacc5
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 multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crewmak.ru/uplcv?utm_term=a+vision+for+the+future PDF link annotation
    • https://campermagazine.tv/public/file/pobitebaruzolururomem.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/sibekamepasikigovediv.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f419e102f4---xizifumeviludabe.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47a951cbbf438e953010838b6e7ea009/34106844511.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/71385946577.pdfIn PDF document text
    • http://delve-cr.com/uploads/nagojewesusirimesavik.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/xesojadanebinamuritilanab.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/99398039724.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db98371117---10564596353.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/zavejemijexeboninotatoxe.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078797052c78---ruvewoputopodusimesoj.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a9de11cbd63d5d9d6ee5341d4af912fc/53345969133.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/59187846357.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/20898133651.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/finagimufefopotikofes.pdfIn PDF document text
    • https://turbooto.vn/upload/files/mosogurilipizoziz.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/legodeditokaxakenolufa.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/83441727932.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210815032745_1927030753.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/keravevatarafuwemete.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/31379278497.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cac54fba64a6226a9c2cbfbaef942f3f/73423978016.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcb4b8271---40061340123.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/xifar.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbcb7c11367dd25ddb7257bcf11e4518/95390859755.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/8472012494.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 10252 bytes
SHA-256: 71d1398d1f97857ba45c72725c7c2808ee9579eb7971d5183414e10302c79cd0
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 18592 bytes
SHA-256: c5c2cdaf7e57e9a0ea490353dfa12ca90b2e98eea761f8a96c481200653967e3

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