Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d82bb3fd4784f4a…

MALICIOUS

PDF

70.4 KB Created: 2021-07-26 11:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8e27a714ccfc92720057d3c4d8b8fb4 SHA-1: b6209104b3a57916849dd1b9c98b830bb29fc060 SHA-256: 0d82bb3fd4784f4a56e515e8a61054a646046bbf09e18b719c9ff5d3eea64107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The presence of numerous unknown URLs suggests a broad campaign to lure victims to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcef9cd538---40493444601.pdf In PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/gisivigubuxujuziweleteko.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/zavap.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4bc3be05---94553870205.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69db5c4df---66090773125.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f40f81ff8---xiporuzi.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/kimupozesosavepolefarix.pdfIn PDF document text
    • https://bczenekar.hu/files/file/8493894090.pdfIn PDF document text
    • http://kag.fr/userfiles/file/lusisefunajalivuwix.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/zefopugo.pdfIn PDF document text
    • http://arablift.net/userfiles/file/lobogerupi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507094115669753.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/tezirofupufowanelinub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simple+present+and+present+continuous+tense+examplesPDF 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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 15124 bytes
SHA-256: e784efb281568b740e4530bf49411edce4d12d345206a2b50a1196c4a708dfbb
font_01_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 10952 bytes
SHA-256: 140de93ae52a27e356ae762065ef463345d5db3e01666e6285ed6d01f8d5351c
font_02_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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