Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2644b9368ea7de…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 17:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a5ce674bb4b2cd91afc3cfa4b00499d SHA-1: ce07d62a74534fbbfefa2bd9d2ffc844e7be8aa7 SHA-256: 6a2644b9368ea7deaeac5a5fa50638e775418e6c09684d00e2dee2bb0441900a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to obscure the ultimate destination and distribute malicious content, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1dafcd4be4345e299c079c4139ae98af/dotelafaloj.pdf In PDF document text
    • http://writtenmail.com/upload_images/file/15800681260.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fct1i5dphdar11asof7eqgndu0/xigurizisadudijiz.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/90121103671.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/fatabuwanutasolosubi.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/88359198521.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/o4sci726o1t0lovg4036c050a1/kixuzevobeserilixufi.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210828021927.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/liwuviledonosedi.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/35435128510.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fopazizas.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af80d0b04e3---9479910594.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/3017598452.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e2f22274---xiluginimulux.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l42klqilqt28469j47a0596dqh/96901617285.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/127c185493057b63a047d981a1574184/27298859217.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/59333014686.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/40akn35kgt8s7aokva4j6orht4/21451246002.pdfIn PDF document text
    • https://vientangluc.com/upload/files/81890309084.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/tadobokajusadexafoz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/nexofupafow.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/49806949848.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/35284178075.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/zagazuselubupadexurida.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608801455f794---45451600638.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/85959422385.pdfIn PDF document text
    • https://serka.com/serka/upload/files/43429631405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sin+cos+tan+tabelle+pdfPDF link annotation
    • 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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 17768 bytes
SHA-256: 4a421b5e4582fc6eef1859d18793d976bbd4e573ef058b9dbc83bb0984f2089c
font_02_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 10728 bytes
SHA-256: ccac25b850c88b7477d8ee75091aea514757673aa6b22c6ff60ee1c43638749d

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