Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb993a644664ec5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 18:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d590af84b1af13d1aa887baec90be4f SHA-1: 3ccc67becbad5e4240da545628093ec3c4eb89aa SHA-256: 9cb993a644664ec5e0183d90f621f52a9e3fa788e953e6628be0779120e85fcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lagostena.it/userfiles/files/degojuzinamuf.pdf In PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/57324871661.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160749dca7dd4d---49538761524.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098e13335f4e---8494452401.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/42276497178.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852bdfdbb26---rokawim.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/vukaretofurunevibu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f190a0dbaf8---gejubogotalugaga.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a348920d---karolowox.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4eac1e4824f8ba0ca8f826b49747d66f/78182486082.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4beac394ff---35196772204.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/tazes.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/75949379202.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/89425141578.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bokijujerobira.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/65214052288.pdfIn PDF document text
    • http://mdtrend.hu/files/file/64002914101.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/62559532684.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/93925959370d02e26aff9e42d54ccdf9/51259566327.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/wijev.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/94785450564.pdfIn PDF document text
    • http://planbmedia.hu/files/48928320951.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/99423942869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=zolpidem+beipackzettel+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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 19436 bytes
SHA-256: 09e5c7ec077f543eccf4fa558b2b2799d758774af17f307f593dbe99db0f44c6
font_01_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 10664 bytes
SHA-256: 2f8d4d45b0e2829758a323b68877f4d388cbd43f15668eabcfd93f8b279c2702
font_02_sfnt_off00013127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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