Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edd65a74d1b4476…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 22:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07d51f50188c5e65e324fe5c63e5cbce SHA-1: fa4af545226bc8e13b45cb38c2e4ee309d583480 SHA-256: 2edd65a74d1b447664e93dcb04eb51459a2aad4f2f6f62f00d050d4a814778c0
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 a phishing trojan. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. Although no scripts were explicitly extracted, the PDF structure and heuristic findings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nrgmedia.hu/files/file/pigupulonikipipexuzodat.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31d0cfa6f---jadawawalerasubitunamev.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48f4b917c---83543410538.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/42193154398.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cad9bcc27---josote.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/58042859813.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/gapabofujifedo.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091706384269.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/seluriru.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/55246044777.pdfIn PDF document text
    • https://htchninc.com/d/files/todufomokajidifipunotir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493f2458516---17213666814.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/tuvonekeradase.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143c207298c9---dojifonurafa.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021982349151759.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914032448.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/92919482246.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/9507249737.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/40884549170.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/83289149187.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/jidijixaguxobanam.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca32f4e1fa---miwitugozabarina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=5th+science+bookPDF 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_off0000ba26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 10288 bytes
SHA-256: f9bf906d6f32c3bf366adb2ef5c69827660af1312914adc230c1b61e0513f3f0
font_02_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 14980 bytes
SHA-256: 59acfcd6115746d21e569e8210028c682030ced5e93dfd519d795e9fc09ab4f2

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