Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc6148b31f5071c…

MALICIOUS

PDF

75.2 KB Created: 2021-08-23 15:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 053cf640f5379c23676cf2f8faad82a1 SHA-1: 39f2c6b2d0b87cf81c5f8d0db5917c4f85527239 SHA-256: 2cc6148b31f5071c38212c78f7483e82e59664812d802ef646f6b64b324ff688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure indicates a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://salvatoredivilio.it/userfiles/file/61089692023.pdf In PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bowaferilusexagunujifo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74a7c4bbe---13921388186.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/58927091df08608f6a0ee879ac096aa5/17427648343.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061902484296.pdfIn PDF document text
    • http://poliinc.com/upload/files/lugisiriwelogiv.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/30148471974.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/31457891989.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5eed66713---80249299301.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbee31c7ff---92624069347.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/8h748olrnbqbqt39os39env4f8/5136648258.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/malogagurulivelibik.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/37653668333.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/44036100019.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fa0b35b5---86974200259.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/71038399860.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249b8ca5c1---weronus.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/godepiposuxase.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/19219382927.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/91997215063.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5c73dc83c---wumetujoporivebunupodat.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/46d3d3b8c53778afdee1afbd97b0a06c/jazus.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/45615720026.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/1079033631.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/54192895725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=here+i+am+mr+queen+mp3PDF 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_off0000bbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 16524 bytes
SHA-256: 108d6e4eef060df5c9b6e4ec06d293fe5ae1a587978a77634335ecd0851454ee
font_01_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 1888 bytes
SHA-256: 4829c07ec776909d0f49fc091f7c8d386ba0d6bb91550f1a64293cf5f2db1f51
font_03_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 10388 bytes
SHA-256: 8d6b9b72c3d1d6a1cbec8ff5639fc532b3d16ca0151a277f8fac8805b2585d59

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