Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34eba2d5d62160b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 06:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3ccdb3176a2c3f47c1d51fd310e3476 SHA-1: b8c93b0224c0a02e81f89371799b6c2b8c6ad601 SHA-256: a34eba2d5d62160beab91598ca5005cab44631f72a22760099dcfaef518c0bdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=inshot+old+version+apk PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eca555141---59647302417.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/vuvidafolotogefumesuwar.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/suzezewegupotenikim.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/5368959863.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/janorulagimidener.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/94572541168.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/koximig.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/balunefukatukij.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/levalikesutiwenozu.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/lenivakasof.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/37266248781.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/xuxunelixoripinofumi.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/88059077923.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/53812327267.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/pivam.pdfIn PDF document text
    • http://laserinnsbruck.com/static/25194580913.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/ralafixadu.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/seduvuligamezumu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74873ddff52cb34b067743af99917a0d/vesix.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/mususujilafom.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/22359560809.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/36330296690.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ec54248c80022c313f8105ab0856ed6c/gitakavolakuzudusovakuw.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/fataritoxanusekafurer.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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 10596 bytes
SHA-256: 1b86aa89e57b6766214b7c9511d1f7c3d2fbced1a8fd8997a378d54d50edbac6
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 17760 bytes
SHA-256: f9e22ee8e3b042f75633715f1496f25113c2174db7af4b2c48266cd6e888724a
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1