Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3710f652b5694b8…

MALICIOUS

PDF

90.6 KB Created: 2021-07-17 13:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6235ed4cd6d0d6b6c2a4941b56a008c5 SHA-1: 8fb570797834f402dbedeb3ac3464314ec441d70 SHA-256: e3710f652b5694b83e0760f51dbf93f03ea3ae87dd58f87220a57574bd05e165
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple PDF link farm heuristics and embedded URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://poltinka.ru/userfiles/file/xawomikiverewivewir.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5cae51be5---96935256839.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2000f0884---18021846484.pdfIn PDF document text
    • http://novichiha.ru/pic/file/88933735788.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/57007106919.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/3418708959.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/getiwuxutedam.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6b9bcb62---42553827211.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba4c75f85---seseweninofaseworusojo.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/35fce7d25945cf984be314efb086c8b3/witugeramilowaleke.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160db732f57ad6---61603635009.pdfIn PDF document text
    • http://kclandscapes.com/ckfinder/triplebuserfiles/file/viwuditobako.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3325ab937a613803dd6e532b2a629159/jixox.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/5152d6799f63776bba10514af8c678e2/zasigaramujeso.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/54496154702.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fd397342b4f38ca1aaf4071ed1ef86f5/jukij.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f445d7ad9---3478690378.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/pojekumel.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/86766867560.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/41580579502.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/10433332129.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dc2a17e65d13b3e6f1e985b5349f68c4/73575303292.pdfIn PDF document text
    • http://deforma.it/userfiles/files/raxosotezexinixezujozi.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/mudapisito.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608141c58c78e---xigotidafosizegut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+bedrock+edition+hacked+clientPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 1744 bytes
SHA-256: fe85e0a8a2678545e8e288ad89090fc3bf64d51d8303fb23b502e97109b2793a
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 17888 bytes
SHA-256: 73d83c13b1dfe5febf29a3cf31496a9de47684fe377ceb066ed1035eaedd642d
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 10628 bytes
SHA-256: 647786d63648a3c3ffe35ce15d33cf34e7b12031436fb627a6f7e66840354000
font_03_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 16408 bytes
SHA-256: a947918ad7af8c72f733d007c090934c17ff0524435d5a4e06665f252dbaf72e

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