Malicious PDF — malware analysis report

Static analysis result for SHA-256 549d12cb65dfd1a0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 19:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bdf57d89a47b4861ee9a41389b2cc08 SHA-1: 0461960b8be4cf76a246a64bfe0e0b680cbffd89 SHA-256: 549d12cb65dfd1a029257fbf6d77028c10e6c5a2f52c50b0bfdab588a31de245
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external resources, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160703a95ddcf8---64759122528.pdf In PDF document text
    • http://hotel-ambassador-nice.com/upload/files/gejanowulufewilajonu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/18d99781b8bb4d0366860af4817a8fe2/kajimubesuzikagu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gituzofofi.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/71895029594.pdfIn PDF document text
    • https://gilbertems.com/videos/file/38646124222.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/67697739915.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vamvd7ksl64ilsd31034sgngj1/37145233464.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/78798355191.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/51621476756.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/wojuvowakuvesof.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5f9ce6e8---fajulodijivexa.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/bugamowuniretarez.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/8709633692.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1d6d893b---panapikojaz.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1123e674ea94d435545810df5787c4bd/97217590782.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/natesulawozalotepekupowon.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wusutesewejekiwuxaxar.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b16dba06be8---86144680357.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a471f039cee---wuzavivojakine.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/kunoxu.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/kidokimupom.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/75333407764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tms320f28379d+user+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 11108 bytes
SHA-256: 2c7d7ec2f163cb10c741344929acfaa228993bed2f56e614113ba068e16d0706
font_01_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 18048 bytes
SHA-256: f07d7e3deb4982541b05a7cb45511ca39631a7997bdd7c88ba9e965743912302
font_02_sfnt_off00013179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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