Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c4a456d746e607…

MALICIOUS

PDF

77.9 KB Created: 2021-07-28 08:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0c672f0ef4ef22c3a86ac081f2508a3 SHA-1: d33833ebd11bc2e3de4a211c5234ca59407cdac6 SHA-256: 20c4a456d746e6075a5010e4bce07443e6dd11334bc1668cc0ade9bf01bc621b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The embedded JavaScript likely serves to redirect users to malicious URLs, facilitating phishing or malware delivery. The numerous links to potentially compromised domains suggest an attempt to distribute malicious PDFs or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6ae5877a650b255be5cecbb88980fb06/31450963917.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd406fb0e---59134869880.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/52397731721.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0eb6a36985c9cd0742cc60e057a05acd/1060730064.pdf
    • http://bigband-ulm.de/userfiles/files/83111039270.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b2cb693d23031dcd3c050097e3856803/gadik.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bca02aa2548---81633782665.pdf
    • http://lideparts.com/userfiles/file/1624189802.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1e7bbc4f---ganuzogoxozewugekuvitiw.pdf
    • http://cnex.cc/images/blog//file/kaxexeruzitafuminemexow.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/29710759346.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/83337826734.pdf
    • http://shinex-auto.com/userfiles/file/46652551613.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/338c57361b87fd5dafc14853d29fa208/xixutusenikaduvot.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38d185b4a---25859627460.pdf
    • http://pogservice.ru/userfiles/file/83403655167.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1f53f8fd---41127227449.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26aa5048ac---minere.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a9fb7e9b---pojelotufarowa.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ggbobbdjukmjhvkthh476iqe62/fonanadoniwogavi.pdf
    • http://leaguengn.com/userfiles/file///7368815265.pdf
    • http://pttaccounting.com/userfiles/files/57938521350.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f724b376fa---89090944966.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc91841842---pesovenerup.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7a7b0e90742a052d4ffb82ea11ebca7d/64382274795.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ka9ur6qapatbc3oqpn8tcps60l/23659773733.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/66023613092.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=declaracion+de+nomina+cfse+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_off0000cd9a.bin
1a59e7941808e63876106a441e97a8268dff5001905bb29f7c144059fa1e84e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 16476 bytes
font_01_sfnt_off0000f6d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 16792 bytes
font_02_sfnt_off00010ef0.bin
b190509c33d7e2bc304d3f32c817591c1ac2b928bac4d7423e4e6accba249e4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 10684 bytes