Malicious PDF — malware analysis report

Static analysis result for SHA-256 79efa93831b933e8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 09:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff09dbfe0b5f0d51838988a150603ecf SHA-1: 5a0e85c9be1a6bb313a4b6116539ad34fb0d9354 SHA-256: 79efa93831b933e80c7f1282c8eaeda80521a7efef12ab2567d91bb8133ae6e8
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=polk+audio+psw10+10-inch+manual PDF link annotation
    • http://renovator.cz/files/file/daluwojuzo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2c1518ba788ba3844639e9a54a26b466/fopetawewunelegilag.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i0mnd44s4p7q6e88d8f0tldth7/53413691972.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/nupoxutelelibik.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/39841578549.pdfIn PDF document text
    • https://sambelteri.com/contents//files/depozisevujomoravuremevo.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/xijupugo.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fosexuletosapexisegeger.pdfIn PDF document text
    • http://fittbikese.hu/files/file/81783513464.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3f03e4c1---tebovilobaje.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/faxepijuwetel.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9c91d40d---54776823047.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3a38c0dcdcbfd510c4ec302e9e87e152/33975609682.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/51426779691.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/19ed6vdtor51m93k3l3mqd8dif/dejawamugu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/49004568208.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/tamemesapovederaxirupip.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/diwurasinuxusimi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160972c44ae001---mivafebudewotibepalon.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/49u34fp5443apcb0jhfm12dl67/padegogexali.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a428a8cd023---76343370951.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/45143926519.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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 17560 bytes
SHA-256: 0c328e9413ecb3a01290664e33b9e8f721276908c767e4657853263717019c26
font_01_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 10936 bytes
SHA-256: 8c1beebaafa34023bf10fef2f8f2e4062d90a943d6c165382eac604ef5e98533
font_02_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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