Malicious PDF — malware analysis report

Static analysis result for SHA-256 197dd6a988e59db7…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 23:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1605301f09e478a69178af0a59a2c92 SHA-1: 336f164f548dc1ed49e60770c515a313aa0b4c9b SHA-256: 197dd6a988e59db78b766f697cc40d043d2c8cdb70141626095a3ff5d06fe0a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=what+is+the+best+video+calling+app+in+uae PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/deaadd9afc94b99a97a85dc95bf16da6/ronamaxuzinej.pdfIn PDF document text
    • http://ailizia.com/userfiles/xodebilirejebixubolugopa.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7bc015b4---14773727137.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/reruwutuxa.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/bifabozipularinajofiw.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/bexozukoworenud.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/42a8cd8ddc892464f046f5c16e7c6afc/kewulomazazesotozag.pdfIn PDF document text
    • https://samtee.com/admin/images/file/mijugivaxab.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pogumopakizunelif.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/61504916531.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/tunopisire.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a4521a7a8e4---18361566293.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/fanikuda.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0c016053---vekuzigofo.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/71010973115.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/varozib.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/5c51f461f635c38217e79d88daa18c48/waximawo.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/98666112006.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ba8fdf46e39628a2a1ca6868eeaa7a13/merapuwukivegefa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949a1b88c61---wizazesadazigijif.pdfIn PDF document text
    • http://biosite.ru/images/news/file/mugoketotivejawunujidowu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb2a06689---88666390608.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5ed75ppae63nb798okmfi9c91s/suxerupomodatiw.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6a6e167297e3a6d7e52b8bcf591acf70/sefulituvowodon.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/zunapalefixasejomowuxugeb.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_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 17080 bytes
SHA-256: e2f77d8ad109ed48a43087f080e2c44b8fb7ae21a0da29f8c01d077cb1ae1efe
font_01_sfnt_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 10992 bytes
SHA-256: f34d12458471a6c0af8ae3c92b53b944284828c52933fd7d155d7e2e14dffbd2
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1