Malicious PDF — malware analysis report

Static analysis result for SHA-256 957bf34b5339e5e3…

MALICIOUS

PDF

90.0 KB Created: 2021-06-25 22:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f94d35f10cd46d85e76805602de18e37 SHA-1: 72edbb6bf8f749594bf7c2cbcebe24048e7a0fe5 SHA-256: 957bf34b5339e5e399b56d626a1a886a627762138ecdf0bcfc91708da7febeb7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://vitalenzyme.com/uploads/fckupload/file/30888512962.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb7d7c330---2844467278.pdf
    • https://filetorme.com/upload/files/10354848902.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085181e1009e---24185839582.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/85dcb27fbf1855548628335357185e84/66634168086.pdf
    • https://werbemittelag.ch/upload/file/tudalixato.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf3b512a6---96372127809.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fd077e4b---72841878968.pdf
    • https://tomas-music.com/contents//files/xopade.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fee2cdb5a---46484965563.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49760ab08---noditulimesegiko.pdf
    • http://amadpich.com/userfiles/file/sedefosusuganozuk.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/929e0be8db15e6c975a33a852c2cea60/59968602555.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7a47f4e3---lilomajigabo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8lhsh3n13u3edjbb26k4tbia02/36349333068.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/79d99ed00a3939aba8b722a3b8bcf476/30821790464.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/lerq5kq0qffql83c31t2vh87g4/6738862448.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793a581c6ef---wolepifozironikakam.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5164b26c3---47665898432.pdf
    • https://rocksoliddesigns.biz/userfiles/file/4255667664.pdf
    • http://yonseri.org/userfiles/files/xigutevu.pdf
    • http://poltinka.ru/userfiles/file/xomafupewiwa.pdf
    • http://dentherapia.hu/files/file/83548723508.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/42dcf90adbb1e0e1a88e950d750fd033/96425129468.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8df6db058b88de4189dc5ba7b6a250ff/21891395095.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/64o1fmo7u975hucljpkf1pps45/31687762763.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accac922aba---66872233277.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/daca1cbc8d6ae066773f0d408919aaf3/domagadu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=far+cry+5+wolf+beacons+locations+map
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d4.bin
67b4375b3978c716841c1eceb248d90d6650d6254833cb7de6f20405ce3d7ff5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 11092 bytes
font_01_sfnt_off00011397.bin
085fbcd91b45517d3e503838f4e9a1e25b1834eb87c7053b3897e7b8d5f2dd20
pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 17796 bytes
font_02_sfnt_off00014225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14225 16792 bytes