Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b66035058aa24f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 14:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14ef97cbc78d2172b83a06a1a32a0fd5 SHA-1: c9423efa9f75952c675513a102ca03a21f088bb3 SHA-256: 49b66035058aa24f366fd292165e7a7583b0881ed3904bc99bbccb59fe1daa09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6464

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=how+to+transfer+contacts+from+csv+to+android PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bhq23hrkb1h8orpjbmf58h8at0/romitogoxunoja.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulaz.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/381b97df72499a03f39bb182d7fe637f/72707680069.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/jizisakujegoma.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/62638279171.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/2024616181.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/dibupenosonarewasijuduga.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/85205630031.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e167a4a4c1---12323568297.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/63r3psaesu5g5me7cu4vdj0r6i/65377999249.pdfIn PDF document text
    • http://chineseclothingonline.net/File/20962731370.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/xiroranunotojake.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/99810148723.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/58738900249.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/2397717769.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/47842122813.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tavepewetosibuj.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b038db349b---77789370343.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/61edc953b8cc327fbfc5759edbfbd979/lovudujej.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/taxazupujufinuwi.pdfIn PDF document text
    • http://e-menu.hu/editor_up/fotagazubivibilituwi.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/tikedip.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-5/20210905030417681053.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/62905911013.pdfIn PDF document text
    • http://shturnev.com/files/foFKED/file/79062953498.pdfIn 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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 17148 bytes
SHA-256: e2f4bb1a6015d26f91ccf99719f30e868ea82105bc2adfe0534363a83a07ae34
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10732 bytes
SHA-256: fe331b66ead82cd6ffb532c6d8b12d9f36c4af707d0f701b38f8fddf9cf67283
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1