Malicious PDF — malware analysis report

Static analysis result for SHA-256 a607f5211725f142…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 19:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46b9093d060dc80bfbaf4ee4904b5a35 SHA-1: 6ee860eea057eb9f00c4ceeebecb1a902d2a15f1 SHA-256: a607f5211725f1420218fb931f1ce93196408c7022ba3463699b5d33a3b26e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=international+removal+costs', likely serve as lures to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nomylo.ru/uplcv?utm_term=international+removal+costs
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f96656fb40cdb03d1211b3caac8f2eb8/93454844622.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd1cb72fb---39895921678.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fecf6a1a0de3bf3d40ef5593ca21b6f0/45593571917.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc024e07b2---19139086601.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6e01045c---zebedibed.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b28604c6---5207486862.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a8be561e0---8263508818.pdf
    • https://deniz-sogutma.org/img/userfiles/file/jenunuzorawulokakixasej.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8264dea65---42500867966.pdf
    • https://sardavetri.it/userfiles/file/66864375555.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/77856273345.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b24bdf7d8---koledibos.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0e5bc245---zekoperomexuzumo.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/lenaxefuseradiwure.pdf
    • https://harrisitalia.it/uploads/file/76731712980.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074917c58583---tixarijilesazomodimuf.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078be9b758f3---17607440352.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/binawab.pdf
    • https://triangle-electronics.com/assets/userfiles/file/pisuwijume.pdf
    • https://cardion.dk/gfx/fckimages/file/24451170032.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2e3fc5568d44fc4ec9f01a1ddf5125eb/nakebijobekiwiwiwuv.pdf
    • http://lucann.com/Upload/file/buges.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160827cdb4ffa6---16625171752.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7400bd55aa---biwotiferenolo.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/85529438698.pdf
    • https://bloc-immo.com/images/19099105053.pdf
    • 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_off0000f50a.bin
b419a8f35d1b538bc693d604ebc3b3053a952f304d2dfce37143d2eae585ac4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10408 bytes
font_01_sfnt_off00010c98.bin
a9a1faa71d3a1cd34f6b4e145b0de7eccc2ccca55bade40f674bf0c094e4a759
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 17312 bytes
font_02_sfnt_off000139a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A1 16792 bytes