Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d176b1cc8885de9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 01:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f53cd28f5b39030d7fa23c0c196df9f SHA-1: 3afc04f4e28264bf566e2781955f2291eba05357 SHA-256: 8d176b1cc8885de9722996d63b9a958a4cf7a8e81493587bec4e91d7136bcc9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://medvor.ru/uplcv?utm_term=hiroyuki+sanada+scorpion PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/amtfkp8rgkdp76434mgc7lt4k0/jaxefavotupuxuzu.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/49101985182.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0fdf6eeac4591b41027f87f10043b315/sizumalutuxabeparamupekas.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210914092238.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/dosoxonasunabiwo.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/74140805673.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210902060835.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_A3C4FC0149771A44.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/23404794774.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/vafivinok.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141acb50a9b9---xudoxaxi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/daafe2fbba07f23e8c9edb808ced4e36/mozenetow.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/wazemokezuguzenawasiwofuz.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/bebamabejelawuwawi.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rizamapafomakuzipis.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/11131759140.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/xusuviwevewodun.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/36832381639.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/jejufumugurojofumovosetaf.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zidamef.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6e536737---nulufefasu.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/dubiwawubar.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/75772639860.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/fufokeda.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/65073200348.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/39729045471.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/8602682488.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_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 15364 bytes
SHA-256: 218faf9f0b8afae51af3775d2582f9ba00da62d7beaa1eab39bd46300eabc900
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 10528 bytes
SHA-256: e763b1291eb049420ac61ccae109c318de6fd8c987287335ad457e4d65ad74ca

Open this report in the interactive analyzer, or submit your own file for analysis.