Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bd08d4278bc134…

MALICIOUS

PDF

86.5 KB Created: 2021-09-15 16:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa233f2620e3ecbf258843b7fda85aba SHA-1: e1fc063a0f26eee61b532365639660731036e883 SHA-256: 85bd08d4278bc134378bf4c90d7e70e60ff1621c61222a440596b30e30ebf6d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5oti7064lvvt8sievsdsou2ifj/jodulosopizofidejopew.pdf In PDF document text
    • https://liantoong.com/archive/upload/files/fibeminezalu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613278a8b6f36---29958215289.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/50671100389.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/60464840027.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/viwupebonirat.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/99760125358.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/18126798770.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/11072968463.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/89318028834.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/zomavakexizesizomenanegeg.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/94870666271.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/gijoxujija.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/32557688253.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/mafubusa.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/samunesusulanukobaxigis.pdfIn PDF document text
    • http://devveb.net/userfiles/file/78833550681.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/zitiwuxegaza.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/resusumabule.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/46133881035.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/gekedituj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d845d19a6---juwinajuxoferarex.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/bejikejeziluselavo.pdfIn PDF document text
    • http://www.polni.si/Images/files/17174672539.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tamozag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+object+removal+app+for+androidPDF 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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 18692 bytes
SHA-256: 22d9378840cbeeb68c598f669b764c3c8c1a26ae969c624eec856f784cee0e97
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 11172 bytes
SHA-256: c02079834ef5896a8d0ab96f8c27b13678c99e871f9616892ebcc875677d2447