Malicious PDF — malware analysis report

Static analysis result for SHA-256 24515b52d79d77c6…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 06:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 856fa3d853686a4ede0728c93866e38e SHA-1: a0f468f9f9a61fd15e779a360abd5bff846dd97e SHA-256: 24515b52d79d77c68a14599060964e6897d45a57621d5622575e00854a0996eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://unitjaya.com/contents//files/vuvojos.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b85f70bc533c5f6a2d9c36a7c0ed8a85/wedinigotanevikufazilurip.pdf
    • https://123natura.com/stockages/files/6282879897.pdf
    • http://trimblehighalumni.com/clients/84492/File/walirivepogu.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e46376acd---poxaluvagoje.pdf
    • https://cornerstonelaw.eu/userfiles//file/8788022326.pdf
    • http://myjobcareer.net/userfiles/file/2021061811262973499.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/207922603cc3a07f253f37872c3a2ae6/torota.pdf
    • https://alperbehang.nl/userfiles/file/25540316166.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/manujorilodovelamozifu.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/34e057f06262e9cc02c37e65995785bf/duzafasutexule.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609abdab56576---58226101515.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8533edca5c2b650295bb5fff5696069b/jedumedezijaleloxefamigal.pdf
    • https://smilepaper.tw/archive/upload/files/vorexataxakosojobufuwut.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/18535706600.pdf
    • http://grandinhr.eu/images/user/file/40364484806.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0e7700bb2003ddb616fa3ae5826366ef/13498758252.pdf
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/munaxovurinasagido.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/itjmulqp8vhnmgd2jaarg6v0v3/35992067623.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f845f5ee55---sovogenurefutilekomin.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/56161543355.pdf
    • https://tvsporedi.si/vsebina/24763853098.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3f258763---38889028901.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f79f92e6926edac8ec5b6d4392a17d51/67717689777.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=python+requests+post+headers
    • 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_off0000fa4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16792 bytes
font_01_sfnt_off00011261.bin
bd46a26092e42f1404a073068638798ab3f87155c3a4bc5c0939a5a3e9d62474
pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 10712 bytes
font_02_sfnt_off00012ac3.bin
fb46d7eabfc0ba4be049d77479bd88094319273b5ad3df4c4e02246402951336
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC3 17912 bytes