Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cec798e7657195…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 12:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4b540f8031075a821f29c3a85c7beef SHA-1: cf9fc618c99a5f53ca992fc6da85514c1a0064f5 SHA-256: 95cec798e7657195f209019ccfbd680def970ffe9d1e7500ba78c9496ca13d8d
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially leading to further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://k-ookuma.com/js/upload/files/joraxured.pdf In PDF document text
    • http://dmhu.eu/uploads/uplib/file/32857313525.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/98774042967.pdfIn PDF document text
    • https://virker-ikke.dk/files/12068640202.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0c85983f---1518562429.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/95412824825.pdfIn PDF document text
    • http://wdnederland.nl/file/nuziworulokedexigaj.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/65786038812.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161383b0fead20---xazakorelewefuvogajijizu.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/83730565340.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/fikesetowajerevi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc43fa0ca3---dofirewu.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/49792848160.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/52538463960.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir19h7ko8j4ci9jjb4nfv3g3eq/finegorejosebif.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/gunozezobe.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/90436487962.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/42268317672.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/zefumewagovugugoz.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fuwepugewewimikezuxalu.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wapobesoluxorenozugoru.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/6492324457.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zolupunodunabuxevogalo.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/xatazujokomigawavatatamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hill+climb+racing+game+apk+modPDF 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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 17900 bytes
SHA-256: 6ed9b8ed69c8ebba94c6af83aecd96b3c6756379d927c0fda0d41ac99a911db3
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10812 bytes
SHA-256: b8e92e1330d4763943232e6ac5ea305c6e4813b53bbbad19bd71119383a4da49
font_02_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1