Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2935619842becc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 14:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49430bd34fe6eb3290e4c812673404ec SHA-1: 2dadfd8afd857449b4e1962d4b2638b4931766b1 SHA-256: 2f2935619842becc1d7c1b6aa25d215c0e3dfa58c1851372a837f414174c85ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=ketogene+di%C3%A4t+rezepte+pdf PDF link annotation
    • http://digivideos.net/ckfinder/userfiles/files/43960279117.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/sititakizujekivibinil.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/xevamezidawex.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/wesajuxulavazixizumex.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8cb8fd1ddab06d63295ab5d73281c16a/27535239022.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/84907363941.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1993ad3767---ralojiwalepufibagote.pdfIn PDF document text
    • http://bakoca.hu/files/file/suratexim.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160822f6f03dc3---77711062106.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/92144717178.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/nukakujodejivejedukarokuf.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a123a1826f8---tebafukasamax.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/siemcglsufutbpp11vgum98i82/paloxofibelidu.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/53738348730.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573d42fd8b---xepafitapevubetobunalan.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd69da606---buwofidexukapiduxobame.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fuduxixupelagujazanugeboj.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7db49c4e2e33768575b155f61a9bb169/68850841180.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b7394972fa5---46303358616.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/14533331350.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090535264613---3987056560.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/torimonewilixulemojuk.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/92428539091.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/57122281041.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/nuvusedokerugitez.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c4461a31860ebd795389f1963b3634a0/fisavawamuselisebawatami.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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 10604 bytes
SHA-256: d6c039e68781a391146dc32e7effa5cf0c80d298534b24adcfea868114a044f9
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 20308 bytes
SHA-256: a96841dc69c08b8f881c3a1b92aab2fc7b2782c5c0c759d13631234dc5e3c341
font_02_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1