Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab6656fe3352569…

MALICIOUS

PDF

70.4 KB Created: 2021-09-12 15:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45ea70c5d90bd73e0f2a80147d3796cd SHA-1: d410043000fa0b115cbd03e0239ef7b5f7e85ab1 SHA-256: 0ab6656fe33525696fbd4bc7c7881212e9e13bc943ab24014bf2e39b6b48e651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b78ba0ef4fed9578e89c5ff79c6b10ce/rixife.pdf In PDF document text
    • http://markaz-e-durood.com/EditorImages/file/49624891629.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/xezazutipixubimesad.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210906073414.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/nevijiginasatidotoz.pdfIn PDF document text
    • http://darstin.com/userfiles/files/21836773898.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/jufadexokov.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/sidilobefadiru.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/vibitebekesutulujiduna.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/zakadogufotunodajub.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/9945568307.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904101117.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/67640665672.pdfIn PDF document text
    • http://irinabailey.com/upload/files/zapamenewikiviwe.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/70208671445.pdfIn PDF document text
    • http://jawarakreasi.com/file/risowipep.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fimazegapusana.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5669294a5ff68997b082952f0fec2ac4/44417412293.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/fojuw.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/rijefususijagukeworak.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/69883688000.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613314557a6e4---guwogawidepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pride+and+prejudice+pdf+onlinePDF link annotation
    • https://mediaget.com/userfiles/files/vuzaxivogibozuzu.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_off0000b5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CC 10580 bytes
SHA-256: 2fbc3e8b27561f38d55f1ecc6143771fc5166d9a222bce93bbafbfb4dfaed0b9
font_01_sfnt_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 15108 bytes
SHA-256: 7702dfd959b8b2352e661db98069c2370c658f2aae2399eaa3a85eca6ddac8e6
font_02_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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