Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab84772bfc29b49e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 01:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38fc68e212b2c0a6f57a25c5308a92e6 SHA-1: d0d921069bb9da17137c3c22ff62427de989157f SHA-256: ab84772bfc29b49ee13e54299af6dae12f13d6d689c7435c8ec39ee0361797c7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to various domains, some of which are associated with compromised CMS uploads. The presence of multiple links on disposable hosting further supports a malicious distribution or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nomylo.ru/uplcv?utm_term=android+monitor+battery+level PDF link annotation
    • https://procogs.com/FCKeditor/file/voriwomifire.pdfIn PDF document text
    • http://cold.lt/userfiles/file/bojokaxikoladoz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dd017479e4d4a6dd2e51ff55e8c6247e/xitajarugemufizomawovesow.pdfIn PDF document text
    • https://dalba.net/other_files/File/21679466639.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1518622835614a1ca200840.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/33617811708.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/78716532250.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/69055120711.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0671d8871---26960310968.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/5792690442.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/31381207018.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/xaboputerumuj.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/jozakenomutivimutaka.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/43291854389.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gusujab.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/25470420795.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/67a8be57fa4ef5288ba6a6ea1ffc84eb/magalizegoxubazam.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5f5b9a932ae1280ff5740a9910586f99/99469156084.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b60ca981a---juxizifarilinojip.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/72856546893.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/tagamujerazobebogizi.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/55630857311.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/1150789539.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/vubisug.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408794df4aa---67071869496.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/70202c3c668277ddc248a30e11805cfc/73680802342.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_off0000b18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18F 10544 bytes
SHA-256: f4f32de5c5d12d57eb837d9e2ff9d043a069b8b74bf4bcf3a83518fe02a1a4cc
font_01_sfnt_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 14476 bytes
SHA-256: 4f9f60a653911499777b23aa1dec80acd29290164584001e4df23de4d6b213a0

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