Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4424974f1c37b09…

MALICIOUS

PDF

68.6 KB Created: 2021-09-20 22:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 836ba9d3035b250a4726e204e4ebfd8e SHA-1: f46df951bb16f36fa2c7f4c456b91d3db68cee78 SHA-256: a4424974f1c37b09686b6fe9de01744df8c47f5235820eb030651572304584d3
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=clock+widget+android PDF link annotation
    • http://dcbestwings.com/uploads/files/22268841346.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/18367fef7495f3c7f8558c46aa3307b1/sexigadaxaro.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/gavejugamiwekej.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/84973663405.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/40360289377.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c889ab3abd---mefamivodivufudidedere.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/58539494864.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/kepesup.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137803004067---16991039476.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/58635845674.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/10104442008.pdfIn PDF document text
    • http://faradbox.pl/files/file/kirifodolivamatimaz.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/28937429472.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906034501.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b7545ab9fca092184b863b2268fb490b/kififimowofapogi.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/62396986098.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/72848258225.pdfIn PDF document text
    • https://curvy.tw/upload/files/23985945520.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/dozot.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wikinekujudojimudeterome.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45a6d3cb9---kusubunujedotemipagarin.pdfIn PDF document text
    • http://evola.it/userfiles/files/43615108576.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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 10588 bytes
SHA-256: b7b5900790bd453a77f218afe93fbc9edecc9fd7b5b13384aa55d93b76deefe6
font_01_sfnt_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 14792 bytes
SHA-256: e2e57a26d6fc7e2c3d3f1fb1a56dd3f4fbbea6dd0e4fa68af483b91782bbb92c
font_02_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1