Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cda69020183cb4…

MALICIOUS

PDF

79.8 KB Created: 2021-08-16 17:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef4d2b39894c1a632b747299886da2fd SHA-1: 293520b5237a505fa69addb014a39ecce5ecd727 SHA-256: c0cda69020183cb49aee3a35725da87829b1cd22b14be03eaa47039f9c032c03
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e65813bc---86643312401.pdf In PDF document text
    • http://artwatch.ru/userfiles/file/zofaz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/879t08tmi6caqde9ujl28hgdfb/81709606843.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fa4d5109---7852716733.pdfIn PDF document text
    • http://planbmedia.hu/files/zikazolizebaxezafisepenam.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/xigunidaxipizatetar.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/201ae1709c6e97f2675139025e27d4a6/46643406014.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/daviwevamugavoz.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/zobiwov.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/86096281168.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/71720027311.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a0861a714e5646bedf7411c3f0fa22f4/mapofelejerefaxasejom.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/62019995146.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bcf818bb564de70f61fe438120242ed4/56409904964.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/73510461814.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7ccd527c35280bf6204f99d7e357c69d/zexitabepi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/nozaluvidonenaxefusotobu.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/bazexedas.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/741271de17550c216879a4bca12654f0/52122529084.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/39064481489.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/76866639551.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b748735c0---rukuxodusumarorigulivuke.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/12150305158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=is+btd6+freePDF 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_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 10080 bytes
SHA-256: 5d852ba3d3c589d61fb180dae3c44fc6bd13179cb3c4e628a565120d3dc57995
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 17120 bytes
SHA-256: b387bf2296e06c89f7f3d362298a83c31bc641d535b39a40d4aea23614f8fc73

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