Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12e87bc813cb989…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 19:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f5711940be412c96cf2e305f5fc9965 SHA-1: e7281ceb466361c0768f734ee830fade3de7c7cf SHA-256: d12e87bc813cb9894953fad73ed4e9ce211e9b5083ab1ad0849cc0538ca8710d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, including a link to 'nomylo.ru' which appears to be a lure for pirated content. The presence of numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=brothers+2015+full+movie+watch+online PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5nrocck2agm5cvp3l1gdgq5he6/31273863769.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/87935155311.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614299c913731---9676335194.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/goraguxekiviwesulaposut.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/zikafilujinagokifuxali.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe061024a---rabetituzile.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab04613b45---64417159501.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/nenoxekowevadelozudur.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/zivopamuguvodozetegat.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/futafafibotenukatim.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/bamif.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/44889246452.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/bexos.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/mokezelokujox.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/juvud.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/stmvn9inln2dlpmj8060lej2li/20052405680.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/51033816672.pdfIn PDF document text
    • https://razredna-nastava.net/files/wuramuwanot.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/mapazezadipelote.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/revojefaga.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/74180595109.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/wutexemowivewe.pdfIn PDF document text
    • http://budka39.ru/files/42024112747.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/marilugezixuroboseki.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614039171d5fd---bimeniwimarunodevor.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_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 17240 bytes
SHA-256: ef977f369926e2bc1498641d6ad37cbb3c3deccaae8b9b4beb3022bce485c00a
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 11332 bytes
SHA-256: 2f43691cdff0637fe226a47ff4e0fd39c54b5231829b8233f8902ad142f7891b

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