Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d4271e3e4a9339…

MALICIOUS

PDF

92.0 KB Created: 2021-08-11 09:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bac277228aeb8fd05cd79a1bc6137b4 SHA-1: 854f72645bc8c53fa865e5bbea643fef8ea7cf99 SHA-256: 19d4271e3e4a933910930d20e2ef1a4bd9bab45ce4d92b67ce12e3ac120d81e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autotrans911.com/thread/admin/uploads/file/14293548836.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dedafdd2b0811c0867dcba51fad5138d/pomuge.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a59efa5540a---ladegeliwoxivevob.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/93528860072.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/03a0a360b9443dde1a4583df5938d906/9257992465.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/uihrpn072l46eas402pkucpb4p/dukuz.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/jofuxukamefo.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/2uo97ub7k3l75j9tk8sthj4864/83973258749.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e93821be8f4251d933b0c8d00279e767/supuluzesi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc45e17298---dojisonuduzodugulezewam.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0oruf9u861a9qn0jutsgdvd3c7/rekaromufexopusameruzano.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/13/tifoweba.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/68753367916.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/564b2118f74f2d053eecef634d8d7b5b/81469251214.pdfIn PDF document text
    • http://alltechsro.cz/files/nofefowaxexevozagurorazo.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/a36tqh4ke58d0gv3c1rokir8en/60920726463.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/lezutiwevid.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/pofanarezilow.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202187225293458.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aab07016bb8---fokakeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+a+blue+badge+at+amazonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 17284 bytes
SHA-256: 01bd9610622f2c70979afed7719674cd8b0b1f6dceffbfd681b93f77d9b55ad8
font_01_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 17268 bytes
SHA-256: 55b95cd96dcc2259f03173b601f923c5d4493d8bef11fa0027c3341b30519367
font_02_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 10888 bytes
SHA-256: b80ece8f6c0528f708f794b5f6ce2c75cc5e2649b8723a68f9b1ce66fc95a00f
font_03_sfnt_off000148f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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