Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9746fa726fcdd33…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 18:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d01ecc6303a80cd5455c68a3872b88a6 SHA-1: 99bef9506aa20b80830386d2a521c8af34b03e92 SHA-256: f9746fa726fcdd33a60ba945e1601aafbc0299f17570a2aea75b854dfca4536c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. These links appear to be part of a link farm designed to redirect users to further malicious PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7603b8741f---dadave.pdf In PDF document text
    • https://pernambucoimortal.com/imagens/files/dowumosamogulabod.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/4243980256.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4unn5oigf552vl1vm7fi3rar3r/garijojokam.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd07df5ec00---37839821187.pdfIn PDF document text
    • http://modern-pro.ru/files/file/68337041874.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zevipuwemasanejumi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/mevadewum.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/87647564141.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/86457154438.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/biwefepabolisixegumafev.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/d4brlbfrreok4ca9qi95h3upl9/30699429138.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/vigebebesuvenelabimoxiwi.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/gusojategeko.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611877f82bcab---48183145413.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kanosaxipinivilorunelew.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e88e1375---ginosekupiruvikiselutojox.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a855c22c79---waruvijejuseb.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/38221548871.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/fewetakerepidalufi.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/gofegujowes.pdfIn PDF document text
    • https://777mto.org/contents/files/31832567564.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/lewagoxomare.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b09021f2084f55f1675e19ea5c2df87f/90638406441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=schedules+of+reinforcement+continued+worksheetPDF 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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 10932 bytes
SHA-256: 2d7d0bba030d8cccd78228818b2a48a11a34606e227ecc5a041572acead4c73b
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 18100 bytes
SHA-256: b3480df1d27032191cdbf6ad2f31f6f232f834cff888d70d68e45c7609dcf5da