Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc26f4d580eb60b3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 23:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd05932c0028a415fb6a1f96c1801a0c SHA-1: 8820e42316f60eb540600ee9c8c2b01f656c8d71 SHA-256: dc26f4d580eb60b3fc95c3fe61cecdbe88bef3ba81f0c6908835ecfa6163b52e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with high-severity heuristics indicating a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mlight.cz/archiv/file/rovewuke.pdf In PDF document text
    • http://jjburgerut.com/uploads/files/58807877244.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5b155507261627a495f2759cc8b06b6f/zowelakujixod.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/66858100137.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/64808438575.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/30873724488.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/30466629586.pdfIn PDF document text
    • https://rjpexport.com/files/74025511067.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/11697278290.pdfIn PDF document text
    • http://imbirimbir.ru/files/jasadaser.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cae5c71f8---66115634627.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/61241709391.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/todak.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/81632151370.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/terukudurupiguda.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/59318776852.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/83415270091.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/34248945084.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313bcd67172---xatijunimafumo.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210906183831.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gilimisitebofepelipanorap.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/2473386555.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e224858fe0---10401017807.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630998978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=imdb+get+hardPDF 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_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 10256 bytes
SHA-256: 86cdd735237e3f67b7e3770d6817d098852618f6417a1142189441a81ab79969
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 18320 bytes
SHA-256: ffc977b64cc97222dbe7a837ed1afb0382f5dda5e7940a8d78a3ce115cd96e69
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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