Malicious PDF — malware analysis report

Static analysis result for SHA-256 a020be55757ca481…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 06:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 18a1d0ebf97502921e43ef0eb45e32db SHA-1: f2adfbe9c253b046706a76412fac8fbb570ea839 SHA-256: a020be55757ca4815229c0deba3b89bc6528d94371396467dc61d7f4291c0f20
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites and disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect 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 https://cructi.ru/uplcv?utm_term=where+is+my+android+auto PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc441dfa0---puvumotekanasebi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/lewexita.pdfIn PDF document text
    • https://12shio2.com/contents/files/pevuzixawosigifigi.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/kagizufukorisodudaxut.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-11/912f62bc975b46c2322021abffe0336e.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/88377865933.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wudizozodevetujivefuru.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/18461965460.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/8058989852.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/dekusopagolar.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/93965274133.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/50054548590.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/90629589277.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/kitoxuxidofosexa.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/wukiguzapusasosomusum.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/54981222044.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9a2c8a90e6ea261623eb05872c67df1f/gijugukuvibixitunuzinu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vunaropavazawi.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/wameriposivexuragisi.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/60454245587.pdfIn PDF document text
    • http://inistor.com/ufiles/files/43500939412.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd43dfe41---44198653629.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/50469005717.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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 10676 bytes
SHA-256: ec5ff827e3208e6119d124d365eca9bca54f40728f2a404ca4aff762feb53b98
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 18072 bytes
SHA-256: 811819df404a4f659ab67c3e30f4b443509945e79b052c6276b1608e0e264dfd
font_02_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1