Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0efafca2ad1169…

MALICIOUS

PDF

111.9 KB Created: 2021-09-04 11:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10f587395ae9e20d182d3d5aa93f612a SHA-1: df44b766ef087aa45d2e68aabbaba85a98074395 SHA-256: 7c0efafca2ad1169f8c61295869c8f2254ae9ed87f97d728a4e079c3fc20cd1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple external URIs and link farms pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious content. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing or social engineering attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=carrie+the+musical+revival+script+pdf PDF link annotation
    • http://playeasypiano.com/resources/fck_images/terigofapasekilisaxifa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497385644e---xexewapixuwaso.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b83a89850---nejazexowobuteruvad.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f82398471a---40394467190.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/fedalixirixuxes.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/sowuk.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/82158309696.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6879eea6c47d416669e2d96fd094405e/gozazix.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e05358cf0---lipenuwodikuzabuwojika.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c634869ac5b---65298649619.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/13412074969.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/niguxakabevelobudom.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/82873404884.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8717ia7k3q85n1pn60d6p7biuc/wovakawaribog.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/volafogijoju.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levasikazeteg.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/51063892014.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/guneso.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/neluwepogelifiwazirokivaf.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/givoxoluxoluzal.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/21715180313.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd0fa8a6a---pisujozegaxukik.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/5477136138.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/20764180057.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_off00014fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD5 18724 bytes
SHA-256: 3c5d527be6add8b42bdb54fef3e4e16710c1e7ae5bbef9a7bfbfdde5654f230f
font_01_sfnt_off00018031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19848 10860 bytes
SHA-256: 459c8e1082a364ce17de97dbc09f9b7b4deb1dd2436108966c77a91294242899