Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32cbc4dc8a61033…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 11:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc4c7457fe4716b233e2c92f2f172d7b SHA-1: 2a6febfa6f9c3a1602dc755de533cafce19c7246 SHA-256: c32cbc4dc8a61033cff67a44fa5655834e240f15d53ac7807868b657c48eb394
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. It contains a large number of embedded URLs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=wear+os+imessage+notifications PDF link annotation
    • http://mixline.ru/img/lib/file/59883098714.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/97188007822.pdfIn PDF document text
    • https://aashianarealty.com/file/natobozuwixe.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/luxafedawosipufadidudase.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090916113927846.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/97165180126.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/pelutimovavalupidizuru.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21867958759.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/30655854526.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/jokajopezetajono.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/17141479387.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sidizuwugabovafaz.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d426d66ae7---zogoverixipu.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/2232923963.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/zanewu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2ehiipru13v2mqs0pqu24ce5r1/22979839766.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/tepija.pdfIn PDF document text
    • http://mopron.ru/upload/files/47320743925.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30d1d0f6f---27275748833.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/53723065575.pdfIn PDF document text
    • http://rapet.hu/files/pomego.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/fozemamuxekuparakarivuwa.pdfIn PDF document text
    • https://digicpictures.com/downloads/xegumijebamerexezojulix.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/86101719246.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/36321352146.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/61009745894.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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 17892 bytes
SHA-256: ef127343ddd726e4bb8d7c87a162eb6396c7e5cea690149ca1a96d26869338e5
font_01_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 10624 bytes
SHA-256: c8f37ab41e1cdab711b04487aa9ff466db7693687da8ab60b66efe57f3097273

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