Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a766480b9ee4427…

MALICIOUS

PDF

69.3 KB Created: 2021-07-03 16:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09f22f544490154068887a1fd0724b4f SHA-1: ecc7bc5197eb4e173cf1022a0541567587199970 SHA-256: 1a766480b9ee44271154231adadc3aaf88545acb63d8cf8bebe9e888637cd861
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f958882e14---8874130523.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b012a0a974c---44420694195.pdf
    • http://dolphinegypt.net/userfiles/file/98360928197.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/800da8bbf31798b4c90f8e2cb859718d/57078656888.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a320b8d6037939017ae535a6487eb557/94903356453.pdf
    • https://tyko.pl/userfiles/file/67913549727.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3d4b0b8d295d1acc95f5230803c5dfb1/wasulugi.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a378942262---nufuxan.pdf
    • https://thaiahpa.com/flash/files/9803459506.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8a8c9863a6f969907e6a143bf87c972f/titum.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7f46c15e51c22608df39d26a36a2f4b8/rivavidawelubametasibiw.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d3ee5cf34786e240e18df3d41096a7c2/27521421709.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c78bf66d---bavotunuto.pdf
    • http://kursadowicz.pl/Upload/file/fusomupatagozura.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/61983f458959df38935043169df212c7/47609933777.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d5dfcb2---mupewosu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+online+medical+dictionary+for+the+health+professions+and+nursing
    • 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_off0000ad97.bin
8d2da6a55969144bad2ec0f1eb5aa5ce87b302997420f29e8c8a514525e2bc42
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD97 11256 bytes
font_01_sfnt_off0000c794.bin
1d49c38d1dcc5b9b61d447576d681c299c62f1437ba76e5994c7428397c56f23
pdf-font-stream PDF embedded font (sfnt) at offset 0xC794 15600 bytes
font_02_sfnt_off0000ef98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 16792 bytes