Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80192097c4928cf…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 22:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fe6897ac18d7e7040a846761052e2592 SHA-1: 6e3479e65da2b3d9dca2ac7dc1d3657fbb15bbef SHA-256: a80192097c4928cfc3e006accd3376ef4aed02a767eeba23d552bdd47d9d502f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://limoride.net/gallery/file/91081210889.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/f6lkb4vq9o5jv7o55brveg91d2/fegewigi.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/14967052839.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4455fa84---fevapake.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/45498477624.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/05bfc3c3902cf628f583898a0704515b/negazifupibo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/489645df3623d9b92046b71c989b5698/83970907200.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/540cdf6037a61b6203238cd9ff97168a/nunadesutoxan.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/44585634270.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cb8a730f05d7801ea9c9fb19fc0ad659/89967625882.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/dotufisopudadox.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/73722336154.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/popavudusadoviguzerusaz.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/497cdf406f6e862dd702857e20c6444c/kazofosaberazo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/711e61ba0a2665157d29c5d0234d1942/54642743161.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/suqqi539o1hosupfv45ugm14v4/bimuzoduvogorele.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8pju7ausvtau8c0bg8h6vop3u1/53386647751.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hbcl5sd7sraup4tfpi4aab5v5l/sarujesile.pdfIn PDF document text
    • https://actorconseil.com/files/file/xovutobofedom.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/23880083077.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/42678381947.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/3c0de24ca9b4113f22ca169f835fb6d6/99664646515.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9101cd3a9d68578a04333aad331c3a71/zurifisepulijiwolag.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/23d48ab1491ea8d090144bf00636fd6b/40138690395.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/916738018c5bfe4f1c618f29446f94a9/fizifegotupodade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=an+introduction+to+the+standard+model+of+particle+physics+pdfPDF 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_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 11080 bytes
SHA-256: e89aec00fe411a03c3e5ebb69df658fb5313a45b516284cabb28a69eb2c198d3
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 17664 bytes
SHA-256: f09c604bb7faa63f1646148fba9ef034beeabb32143d571109cb47b402fca8f1