Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6246b7b533eacca…

MALICIOUS

PDF

82.2 KB Created: 2021-08-21 21:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da4cb005211ea91e5a5ad822b92121c9 SHA-1: cce8b7adc885e78105596b90031cfe731c79240f SHA-256: a6246b7b533eaccabc55c64e1357f2cbc63a770f4cc16a9a22cd569e9501e9ff
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. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing lures. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/220446bbafb8b000baeab417fc055f65/44677165707.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/nawejuxu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/jomotipewef.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5aa79a647709beb95696124fcf09296b/girowi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfdd566257---ruzox.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/b9v7r22jt7k3vekuq3qbmpnbud/leziwizobesizapulex.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/51326517158.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/pajukixuwavotopituju.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4456c380fdcd84c456fb2ad62b1b55ab/kajozedavuxume.pdfIn PDF document text
    • http://djpress.pl/Image/files/roleditofisedum.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/sesaxemotuxazuxex.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lukinisubezavizoge.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/45459156172.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fef7532c943c3fc8d30a7b9ad7a1be34/27262146715.pdfIn PDF document text
    • http://texmet.pl/userimages/file/69998572201.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/kolanibit.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/xuwenetejivewamunavuwub.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/89108370212.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/01b2bb15da423fa207a4a06a84245785/romaxu.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/28873668664.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/62306852651.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac107b6010e---76034229314.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/tipaparodomagemamesa.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/modedefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+my+vizio+sound+bar+to+my+tcl+tvPDF 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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16284 bytes
SHA-256: 396067c2c34773ba652c2562475d48531f51e2a8e51405389fc7a9e0259757bb
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11088 bytes
SHA-256: 58213faee37e7875a8044a3c6d8aa3129943fd1f9409520364452a55d351d1b4
font_02_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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