Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad937fab1a08283b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 15:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49b79d04f9abf020c0d624561db9a48a SHA-1: aef7fe6da89ce2c8b3c8695852f05785b877a416 SHA-256: ad937fab1a08283b005067f02e8a1626897daf10c6a1cfe257ad6a4dd36d6e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=advanced+english+phrasal+verbs+in+use+pdf PDF link annotation
    • http://incomingmakedonia.com/files/files/diwuguvawuronavovabetipa.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/49993842081.pdfIn PDF document text
    • http://viorina-deko.com/images/file/nesegotosikajutofevanov.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b81191d4c---wozoxuwudi.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/rulanu.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/11621128335.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kelubat.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/joretoxivox.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9ad994440---vekawatanaxotabewoxubarur.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/1650934367.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/11628152334.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dbjuaq1sgjhda963qbgru3kts1/magubasewofowiwewaxovefes.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/102130563.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/26744963979.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/bazinifufajarolurur.pdfIn PDF document text
    • http://winso.tw/userfiles/file/risixamewamigajajubibipa.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/83671862606.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/xazetax.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/lenodurabobutire.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/8668967050.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/xagolomemu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/vekupijivapevonumo.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_off0000b574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB574 10968 bytes
SHA-256: ec1754024ed07c232ba28cb0a7c6be755bcd27f585fcdf1a626ec733060d077b
font_01_sfnt_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 18192 bytes
SHA-256: 18f79105bbb1914b1089b222b7a5531c575f6f963ff80679b5c5b04f7e3ec97c
font_02_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1