Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cfb6912ec16243…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 17:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77c63bf7f91801d9c50a974f8ce742d8 SHA-1: 88ac951c7949970f31d166f2768c61a6d4706200 SHA-256: c1cfb6912ec16243ffd5d34e1941bb59bd6ac82eec4162b91fbfab0ae234bedc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains and compromised WordPress upload storage. The embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=split+pdf+pages+python PDF link annotation
    • http://jonellchem.com/upload/files/gawunujovulopawagu.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/23147372931.pdfIn PDF document text
    • http://camonetinternational.com/files/file/mevazov.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/422bfd448d4ac0ca585cd532483a79b4/92634825316.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/motisuwomasadotorogat.pdfIn PDF document text
    • https://press-centr.com/images/file/vesofisitutozumaguwujitip.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ff3c8fa56---58017023048.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/93971729246.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081004edad16---55690653288.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e6f6a7808122f9eda107fcc21f270276/kajiraxugapuzil.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7ff3f35d1---tanaxunusubo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c4ff6a86d---90386141024.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/sazoselik.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/ponit.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/zapesezax.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/10983243961.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6538189faec25d019e77374ab72a0013/vavatefovubebedejuja.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c0336dd4---fotumexevenobiwix.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116632ee8495---40483386908.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/c10dt3db232fr9rv8k5bervlsr/witoruliradoweruvofi.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/80782748918.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/luxiwopogivuzusenub.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1qhsg24c16br04vb46ja0dirbb/34781334232.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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 18472 bytes
SHA-256: 482df7b54522766bdae9a18ee23242666dd7e06d897ee074d3c944be41fa2524
font_02_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 10864 bytes
SHA-256: d85fab5d480437fd65481a38a97535f939ae06e14c55da4b6a568ad985686768

Open this report in the interactive analyzer, or submit your own file for analysis.