Malicious PDF — malware analysis report

Static analysis result for SHA-256 163eb1afdfe0762a…

MALICIOUS

PDF

79.3 KB Created: 2021-08-24 19:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1d5d03ee6daf5e4a95f87f9e6cd15ad SHA-1: 319eb762bd44e1b17ab1f1c24633974b74d61d4b SHA-256: 163eb1afdfe0762a8b841cec99b41e92e1695acc8a5c4d932ccaf5c366eb37fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs are likely part of a tactic to obscure the true destination or to leverage SEO poisoning for discovery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf88f52fbcf---10141038941.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/814263b046bc8480ca3ac8ad63f434cd/38631815079.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/49795862299.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/72119829540.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ed457b01a473d561d796a82692748c50/vutanukamemizizobo.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/tisemedaveguzuxodifi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160876380b35d3---59786248939.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210707_841A94BBE38CF0E3.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/45703297047.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098560a8f87d---55976304272.pdfIn PDF document text
    • http://camonetinternational.com/files/file/7567447854.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72dbe5c196---21618530787.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/valebos.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e73d941e57f---jukefofikilu.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7bpr855rlngjehhoc2u38jqm22/noxirez.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cfc88c4c2ac3832e332ef69792d95c28/60169849914.pdfIn PDF document text
    • http://tfforming.ru/d/files/zarakorirolotavuba.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/idn5m820cvdih2pbd4a0i312g4/satononukep.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e71c72d39---9683978671.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/34282376044.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/mboq65sosugdboq768gtdcjett/gasavodapur.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/10579811876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=phase+change+calculations+worksheetPDF 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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 10788 bytes
SHA-256: 39a5409a89afdc029b67279562162314e7c74ca064c0c93a09975dd5fb2d78c1
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 18040 bytes
SHA-256: 07b9c85333d9824f509696d48c78a423b8e09d56e08b71588b0603dea0ead48a
font_02_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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