Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35cffccfb6ebfbd…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 04:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca0a7b52a9948e7b2aea18d02f82d8e2 SHA-1: 253338891418d14638b237536b2bf627797a67fe SHA-256: e35cffccfb6ebfbd89f79444e6d2d43412dabb4289f775433e69234c1943b5cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm used to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9dfbc053e---64916215749.pdf In PDF document text
    • http://distributoram.com/files/file/vozuzemize.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6236de85b---womelonavevezujow.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/43840561115.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f6305430d1ed0bbf047aff3ee3acf32b/58982937179.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/kigevepawisogexipofa.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kerukiwekigifeka.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/brrpl4r8o8fu80s8rb44qtrokl/nusoge.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/226144ca4a70f4994cfc6f85670144f6/80238088917.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/rawojesikokusotalefa.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e17d6ac7f8d---binudamizetofowizu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3f4be775---7418774817.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210523193126.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/69108837508.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774a628ecc7---taruw.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4f2ebafa---wexusisazipav.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jj7lbvvjksa16cqc3s9gmpme71/toxekidu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a64e0cfad96d8fa2bf83faa48562b782/likufikekumiro.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7d206672c---vawawisuzolaputidoxevad.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a318ff7cb49f6e761fcbaa7fb663283b/58509956066.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/89729288416.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609475a2c16a5---39855337165.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/retumovurozos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=neven+maguire+christmas+triflePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5860a9978bdf78c4d1be6c2f8f092a36/79821135373.pdfIn PDF document text
    • 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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 10808 bytes
SHA-256: 031a89a17beaa3fc4d9efdb685035244337174ad6f06653c663feebd531b22f9
font_01_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 16860 bytes
SHA-256: 29661ffaf4c6bc04d65657f7d7a8393d7a9ba0c3886d7ce67a81dd96f0c612bc
font_02_sfnt_off00013be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1