Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76cecdbbb72f3a8…

MALICIOUS

PDF

104.9 KB Created: 2021-08-20 19:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1021354beed724554f00c961a419ef3d SHA-1: d3de4c2e97355f946dd47cb9660c544077980a66 SHA-256: c76cecdbbb72f3a8f42402ade7ed81fc9ab2aeb777ad447761a8fea25fea3fbe
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://universalestetic.com/userfiles/file/korepuxitulu.pdf In PDF document text
    • http://01host.ru/userfiles/files/zotulire.pdfIn PDF document text
    • https://tavio.ru/files/file/49060769771.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/kibebiraxuxewopulajeveru.pdfIn PDF document text
    • http://euro-ex.com/79223620905.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/41766838555.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/82175689903.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2fee43e7eaddeb1df985c5a8565ceb35/171620483.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1ae4a2e6c8bdd83f4c549490b7bc41e6/7673846266.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/648cdse7i90b4k3nmklv29451t/nagatogavegu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071470cbf9ec---65590612535.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a23856e9---nufizowabaguforafalem.pdfIn PDF document text
    • https://rinducm1.com/contents//files/53144694407.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2vr1j1uepa8quq6jv55i4vfth9/lofekajelazuz.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/57630092636.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/teresut.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/78296716182.pdfIn PDF document text
    • http://abnicum.com/files/file/99547114118.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bopesiguguluwijufomubuzub.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8d663c2650a93c653b9c306c314e3db7/nisowavamavepi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c34acd6d73f64f04dcf4a2fa1c8289a6/fivifazekogalexukoj.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/adc7485124589cd9aed7fb64c9a56cad/59067724708.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb940f3e76---xilatabisarisifopidoketa.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7fa638e3c566a1d739e0f0179d76b03c/kawusubape.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc79bfcc0---59817251478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dbt+mindfulness+handout+1PDF 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_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 10812 bytes
SHA-256: 12ffcb587e9ac64941ad8b5b6213dbfea6f7b7a40a936adf147bd386985a36bc
font_01_sfnt_off0001521f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A31 16904 bytes
SHA-256: 87bd08267d502051b5b94a2ad7812b04543c06138dbc342894be461a2a6149b1

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