Malicious PDF — malware analysis report

Static analysis result for SHA-256 7679c2833b46cb11…

MALICIOUS

PDF

81.6 KB Created: 2021-07-23 22:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 28cf6169e1844e0c89222ece8ec2692b SHA-1: a36124964962fb4e45afb7b4184b6c3b2817751f SHA-256: 7679c2833b46cb11758ed9d471acb04bbcaf63437315b929b4f6c0aa94f083f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/tepepejokunuruvafo.pdf In PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/91117707213.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bfdd06b2d9fbca55cf365cfa82791e8d/vonud.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/fabifanudevanirabelixebo.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/bataginidavaniradefajevek.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/kopoxek.pdfIn PDF document text
    • http://arslanemlak.com/E/file/67331292702.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210716_E382F4800747F77E.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c005ffa39b3---43145788523.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d1d5e2a8f63b846c875c16ca5784917e/5613512445.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/c1b0355c62453d0c285f2aaf1dc6c0ee/terozemafel.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/34253575614.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/3431135118.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/bosunivasuvexofewudofizev.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/13415519557.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g9j2ptghs5ul2qb953j721l7k6/jolugezomuvi.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/83552294947.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/44b20cad13520ab5b9d543805614559d/kisexuzobedoraxadapomema.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/16877349039.pdfIn PDF document text
    • http://camwater.org/media/files/talisejumimawag.pdfIn PDF document text
    • http://babamoleskine.com/files/file/84598290211.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/95936030154.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718d20a586e---sugawejapiduzexazitofofos.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/44eb847f50127069390b1201fc21723e/84071288406.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/aeq5t4cvrcq06nmkm5k4h1g194/51977778147.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/db8d720ab5e3dc09dc2755074947ed33/vitaluvaduwudazipokupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ferit+devellio%C4%9Flu+osmanl%C4%B1ca+t%C3%BCrk%C3%A7e+s%C3%B6zl%C3%BCk+uygulamas%C4%B1PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 19432 bytes
SHA-256: bc69e95dd74f04a22f36739bb4001851e8719d0b00aab044b80346efc189c96f
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 12008 bytes
SHA-256: 6a5966fd8f52558a1de1c11d4184913ceec80bcfc52bc60daef36a113be0e23d
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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