Malicious PDF — malware analysis report

Static analysis result for SHA-256 28916afb3e237577…

MALICIOUS

PDF

96.9 KB Created: 2021-09-05 01:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51437899b8383032b73085fc2f9ba806 SHA-1: 74b0cc36662c1978db32eb90c60976014a7f382f SHA-256: 28916afb3e237577456df612c353ab304c6ef06ea46adc089f2858af0c3a851b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a likely redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/54734916475.pdf In PDF document text
    • https://perfecthospital.org/FCKeditor/file/fitiluduwabaxunazu.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/69560319750.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f4ebb2c9---63320304561.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/68047676548.pdfIn PDF document text
    • https://kopari.hu/files/file/topawalovokosekivawoxiz.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/91509347937.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7883194666463239a4fa56d6dad433f3/minejivuja.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1d6ebd5534982618a9229adda93feeb0/nepibugamepaseduni.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a80440a44815a503ccd9c57a7a0e64e1/55488680656.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b824c1296---gifawigerexadoxalinesep.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/romikokubuluvibowozopan.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/9490237572.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/83670008440.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16116a01deb6fb---dekobuk.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d9473541515c5530e80929b3e02d2e02/pepesoresubokejumiwa.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/51267127218.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/66504502004.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4a057680b5b42cf3541bdd68c7627f9/limifekizabanubinetojuk.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/75582971022.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/vevovozogikuzetezon.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/nuwibejiranaderiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=capture+one+12+manuale+italianoPDF 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_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 18516 bytes
SHA-256: 1b0b8a430ea90ad633bebb1737840f02e5f0caf419cc9fae0d264c413cd2602d
font_01_sfnt_off000145b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B6 10548 bytes
SHA-256: 439c49c52864b152acba9a60445bd07827a05b49d85139bb4f4b1d03ff733cc1
font_02_sfnt_off00015dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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