Malicious PDF — malware analysis report

Static analysis result for SHA-256 970643f0c218001a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 07:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8c0a2ad03eb88b626f9dd46b86750ce SHA-1: 8b036d646034f8c7557bb706c53b69a5600df688 SHA-256: 970643f0c218001afcf94faaa18a8367f72956b080ba0bfb0c8cf1530fec6965
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://menu2uplus.com/images/file/95638977545.pdf In PDF document text
    • http://kite-surf.sk/files/zesajebikosejonolefonaliz.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/vefupenoz.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebd608d8b---lowirosinexofulep.pdfIn PDF document text
    • http://pi-consulting.ch/download/79255404815.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/02400faeffb7fd5cc8638ccf57052194/pemuwavumoj.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d97db3ef4c0dfc3a63b2db16aff70ee3/37698575908.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e26cee6455c---fubuwa.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/xerevitusugojazo.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/77325792982.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/48f9fe8a8116cfbe427546fa05024aac/zavirubulinibo.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/36529699636.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105780c93c1a---33354447466.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d880cfe6474675638904b098af2be891/dafagikixapuzogow.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/rogadavefamefo.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/xibexugetenuxobar.pdfIn PDF document text
    • http://homeopathyhk.com/files/wupuferinupoki.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/noseparimutukemabejib.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/mewiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=simultaneous+equations+with+3+variables+pdfPDF 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 11548 bytes
SHA-256: 410d72f2073900918f060b92b1c880fa7fee0b6cffbd5f7fa76f76db6a2a9f7d
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 17852 bytes
SHA-256: f402de583b021cb574b415f954fad4cde2bfa1575724a78b925625f2e1a70661