Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a6724743fac9c4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 04:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd2f3b759cda6b3ca139c8c3b9aaa9b7 SHA-1: 2d0cc9dde2489bfdf0feda5bf5ecd09340ced8d4 SHA-256: f5a6724743fac9c43d7734b2a27a2f70d8bb5364a88848fd84a7b098fd2c3d0e
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript stream likely facilitates the redirection or further exploitation, contributing to the overall phishing and potential malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=sims+cracked+apk PDF link annotation
    • http://rld-carbon.com/file/zobujal.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/tiboripetifix.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/dozivi.pdfIn PDF document text
    • http://mextro.de/upload/files/dalaluwebepadoniv.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656dfcd6ee---19859231990.pdfIn PDF document text
    • https://castel.ro/userfiles/file/gomomaver.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/zojexozagopi.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/57980000483.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/53961051645.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/35840277729.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/fitigezogezavajepuxu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27073296282.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/57748431798.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fojevis.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e8d6e18ba346ea55474cd4a91ceeec95/sifodesupaviguzal.pdfIn PDF document text
    • http://exosushi.com/uploads/files/92996672843.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://mbamantra.com/ci/userfiles/files/zodemikusekorugef.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/79804701504.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f7c30ae3---wusemigaxazunixumutirozun.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/23279065894.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/xodevizasax.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/14414572089.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/20243127889.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/12243567531.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/vuzasarexera.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 10472 bytes
SHA-256: 0b63af362955ec43689ab6aae5e72591ee22bb5cd7ac1ab817cc5dcabc210b66
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 18028 bytes
SHA-256: 282daaeb792e7a1f58ca940315edc34864e70ebbf35842ab5655ad8ba0e50e81
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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