Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cab7c16fa50962…

MALICIOUS

PDF

90.2 KB Created: 2021-08-15 05:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c53ab02b2d149c1f9ce652bee8d2e498 SHA-1: c66ac8525d46a733fe789f12357857651c13d8a5 SHA-256: 06cab7c16fa5096286bf66cc684c4e8384352daddaabca9869136ba6ba698082
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of link farms pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content. The inclusion of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://armenia4d.com/contents//files/muwawapotaxakaxuvepup.pdf In PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/novasupesakitar.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210622_414A413877B467BC.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/52398049757.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e4d82274---zazugogogesewej.pdfIn PDF document text
    • https://room12shio4.com/contents//files/zepetajajedep.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0b7b9a5e0a142f0ec896c847f357ade6/80360369772.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/poman.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2a33c67cad23eb0f78a8bb84766ce38e/21819103681.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/95689138984.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/tosoraxufanijevon.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c4133fa1a0de1f28da1fac174d5fe759/35061323424.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/1085309567.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/93565704971.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2e7c550b68534e8abd44813685f48b9b/pubib.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/37356229082.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608463fb2eaf8---72698961656.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/90943433867.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db81cdf2227---sililadada.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beec5f88cca---rokumipixokazidofuja.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/26491885535.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/0a2595e64018d577d865d1a8a8ea5521/83303066207.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/37093950942.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4085e26559768f52c8103618ff16d73a/7607592432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+chuy%E1%BB%83n+file+%E1%BA%A3nh+sang+pdf+offlinePDF 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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 29648 bytes
SHA-256: 0e3d90280e36143c567ed83a89e319eaca66c4ccec289afc7372b9e25ed667aa
font_01_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 11944 bytes
SHA-256: 0bd153fc5c0cff1dcb7c37ce05cb609b2b32dee52ad2d24d0a2f572aea9ffe40
font_02_sfnt_off0001408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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