Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04d79a054fd44e7…

MALICIOUS

PDF

91.8 KB Created: 2021-09-09 12:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2c72bf0bc9846af07d0102a5553ec57 SHA-1: fd9daea7ce3ecbf2e25c3253dcfbb9c2ab24a10d SHA-256: d04d79a054fd44e7dfa52c337aea0facf16a2d9fb8837c26850de14bee41c9d2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://playeasypiano.com/resources/fck_images/80713953194.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173165dbc1---vuxeduxokolurafeves.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fatum.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/56171491421.pdfIn PDF document text
    • https://n-tlg.com/files/file/zirasidaxumamukogirabe.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/jerukakiwebanusaf.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/78673652449.pdfIn PDF document text
    • http://stylekd.ru/files/55137756438.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f588fa70f087dfa00bbceebcdfa3bc9d/nasabokuzodabixe.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/29893486110.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6d80691e---nogizixomu.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/76411063038.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/789899284.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/21039793158.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/nafivedugomosogojekegam.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/vitonizazerugugopu.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630766731.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613961a1cc93e---25418198106.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/damowuripe.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/lewavojimumixexogusutabu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a127aa9e8a3e4d38f79ec98595e3a26b/23957520453.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/xodijepamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=keyword+surfer+reviewPDF 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_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 18520 bytes
SHA-256: f98409e205d1e7b23cef6488469c34434ebb4d33baa46350e43f648dede38fa9
font_01_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 10296 bytes
SHA-256: ec9872d9cd64f029abc474984151e356578a0113bb903979967f5ee57e2f7cdd
font_02_sfnt_off000149e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1