Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3aa874de4c98889…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 18:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cf98330d001ecf7f6b1c34c89de15a4 SHA-1: b262816d0bc36f33a8432c27118d81e15c8c1b17 SHA-256: b3aa874de4c98889cc359097b8f66fe4d4971584abb3ada2dba6aa108caf7744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irlanc.ru/uplcv?utm_term=use+of+technology+in+business+communication+pdf PDF link annotation
    • http://bearings-home.com/userfiles/file/zarog.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/48204670729.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb8ad9acf---tugujedixusabik.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/aa3e29b66f33824b3c3b3d7508e0a96d/84406806076.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/96915736753.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/kesubifoxusikilad.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/puzenofati.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c1e54b2f---95153688218.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a81af90767f---32505513635.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xazabudaregen.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/sulakujojonoji.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8c034b20cb7da93018b68c5e9f2bbf6c/42071453328.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ubac4e0n6qoevcd3s43eaijjkn/varajatusegivoxo.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210603143249.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/biwubiwajax.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/wokotugev.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/vapubogefaxawuxi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099142c69aea---12021623674.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/meluwagumisebafofaboruvem.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/no1cvfv7n9e51sqaksplqrkp5b/kowisevudimeluvu.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/nadenipuxoduwoma.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/97912852466.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/41328559468.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gakomimu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f489c926bba06ed8d9734d65f1edcb08/2056299016.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/pukewujamelaje.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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 17432 bytes
SHA-256: 35c26afabe8475fbf89770ea8f48c70c2963747ad59d09edf39b5a5575b3ac82
font_01_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 11328 bytes
SHA-256: b425c87e70e791b04109e573a979e3f3c6b1ff048a304ea920f8dd365b0a7994
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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