Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d8357beb8c76bd…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 21:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f09d003139d6fb11d49f1b607e0f4a9 SHA-1: 3bb7f44b3a2ed125729e4e7de8df3c6dad5d7799 SHA-256: b4d8357beb8c76bd79e65fc5e17b9f56189d1092ca7683043473aea08b980b14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is likely used to redirect users to malicious external URLs. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=oregon+trail+card+game+house+rules PDF link annotation
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/16641864699.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/31af994b20561302529a0707abe6f90c/turavidi.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/95672065867.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66ea77f40---29925107040.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/zuxubisirumitutesifa.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52542d9d6d---wejedogokiwasodozojim.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c0690cd8b18---45358039756.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/16889000725.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f26b6058---62596379469.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3c4a9da8268ca5a8564246f283ff8833/72490948975.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/42978388812.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v2jp26om7brq6sgo454a0tp3c0/gaseleromixojatesadir.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0cd144d22---kolavakuxurekepuriwa.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/12002422805.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5fc43172---65761654103.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609262d81498e---68777892238.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/diwuwodazatur.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088dddaee03a---89623692373.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/41130482872.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/zarenunedob.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/55069236862.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/28687522136.pdfIn PDF document text
    • https://ekransamara.ru/files/6908135303.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/65abd9ecc9bb1f0040d8928b22046ef6/tavupagiguzajiralalesa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac0e186f9---tomesonup.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/teii7ei1loij3abh4d7k4hi1h0/68293383862.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e3181c4d00f7095e7631cbc08cf5bd1d/77970238725.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_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16848 bytes
SHA-256: faa64d852a33233f4b5616f88f9a5a44e4452f56c6ddc104d478f3f43ff79e5c
font_01_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 10944 bytes
SHA-256: 857d6ff7486ac9173037fcb5312e765f6308c5c718470d888f28eb1fd51c8804
font_02_sfnt_off000136d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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