Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc13e5c1bee320ff…

MALICIOUS

PDF

89.2 KB Created: 2021-07-31 01:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dca0d45500c82b8ad1662070ef685ff2 SHA-1: ab7c70c7107258aa1bf312955661b4a264d6f1c0 SHA-256: cc13e5c1bee320ff16aa931ca2cb929ee69317a9ec04ee62feda2aeb0cc5df21
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting, likely to host or redirect to malicious payloads. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=ap+open+ended+questions PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfadb1ec6---48709573447.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/99457148432.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/48939854276.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a283100c48de499e8cfcf5635846e052/68921852732.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/tozunenuxapubumakaj.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/76625512839.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160998590b8ac6---jepunujuvukimoboguvikuxa.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kedusilufe.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/40494728851.pdfIn PDF document text
    • https://amblamy.ee/upload/file/vekemuvalot.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe8a8a3352---pesakiwozak.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4cuvs5jsduh1dhdqnc943e1r01/divewilejeno.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/rubodonuriregape.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/iocdpc0e5s8d8tujbeksn8jje0/patajuguferep.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0c1b700b---48502925585.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-20/20210720025407307619.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956151c038c---piwezunixu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uph6ndeg1b1lf0bbuhn43a2as1/mubexilexubeliga.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f5ed65c3d5e2288296e1131df08f49a1/25158948511.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/jirixilanisumikeveva.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/mesiw.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b320220e222---fifibiwubif.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/44738403106.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/molik.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_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 17420 bytes
SHA-256: e3ae157e81d65075775cf21593529798bf4bad19c33f2d1bcbf331c6ef606459
font_01_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8E 10304 bytes
SHA-256: 81bdc4c2294bafce4703b499d1e911921f9d78c38ac6791370171b31ad55a8ac

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