Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0870b28ab18f2ce…

MALICIOUS

PDF

84.7 KB Created: 2021-07-28 08:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad269f9c6797ca1cc8abe1a434d059d1 SHA-1: 7f4e838f0538d6db21e3e036240b2b4543d552eb SHA-256: f0870b28ab18f2cec04c0d11002511e52a1f9a05df1457e3e7bfeb2bb019e387
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/in9sccknk4ibnlqfudpufn02ti/gejefos.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/99f137c925c3253f65e8bfbf2b253b09/kuwazusum.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/65353577992.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/96383556019.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fbnu4aitm5ieovk8ppl4oobvu6/94570362053.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/4u53ob1b64qi5v7gmvhipjtna0/purowefanirinilijeroxeso.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/87737362833.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d0a10d75---84365943316.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60824499003.pdfIn PDF document text
    • https://digicpictures.com/downloads/16823298687.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/rumajunazusawalapuse.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/84547a72f5d89fd628411b10af44bb95/69504597549.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/90897436818.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b8001cc1f91---77937761070.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/maxulan.pdfIn PDF document text
    • https://magerp.org/upload/files/77019708503.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/12ef5e14505e2843faa5f16a0c99530d/wezavagapekewabewu.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/5176397480.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zisomixawomudotebokaxulu.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/90623095400.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/29bfb2f142608bcc45cd9429047a14f5/femoveza.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a31eec3ca6f---96373337811.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/77263265651.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/80cb83c62f2527c323e6217904420b2a/wizuruzexifub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+put+mods+on+minecraft+pePDF 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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 16924 bytes
SHA-256: 53978338f692c0d82bcad1d51d9277c8632ca4e02ca05753595d5fd71e72d837
font_01_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 11024 bytes
SHA-256: e9f3626f6131f71a889848f1a1e2d4501a11b10c271783fdc10d7edcecbc9f23

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