Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a080b3ddc13ab7…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 22:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2d51e9cec4484782793cd199add3143 SHA-1: 57705cbd601b2f2e7ca2f398b4b8ab1e01de2449 SHA-256: 83a080b3ddc13ab713cc2994f0ea5a5cdb9f13cdaef528ae3c747fe5bd188e77
156 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 links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and embedded links indicate it functions as a lure, likely to facilitate phishing attacks or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=assignment+on+tenses+pdf PDF link annotation
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3taigqp2o71kficsc3ps9do369/minebesumologajesegozo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jagisuzodobibo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596cec65e8---79833312853.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/891df3e122ce017298aeaf37a2172141/kiliz.pdfIn PDF document text
    • https://ikima.fr/uploads/file/voxogomematada.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e65dd4ca11e1f576ddde3efd167f306d/bujepalag.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b8ff7073c---83321054593.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/67231471192.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/004ed38f8beef1f28bd360c856f000b3/23205733342.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/pofudoso.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/p4jr08quin7kb77657vmrepbgk/fuduwosowaravomoxig.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gvfp3ekq68vmuvtf3pirikfsu5/libanigoxavapo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/18955580222.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1dcf2cdfd---52124590150.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/15908675530.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/fufunapoliviv.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/fifovezibisexa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8b587620---runaz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b537cd5566928a56a5f9ce59a8eb40ab/41191104445.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609738cfcc801---tunuwukavaperedow.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/41332350206.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nodgjvan1a5lhq7oaifd62tem1/47753703001.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/73725764330.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/nuwumogofe.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u4rbg9e64kfjjbcmt5m8anin04/zoruvabiwinemutabovupurov.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kdqtsq47dvatgejv6o1pevb1d5/zenixinoniruvuvet.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_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 10516 bytes
SHA-256: 2cc62faa1fb972700ec2e2bcfeccd211e4ec15dbc5637c4a04f003f9147fd8a7
font_01_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 17656 bytes
SHA-256: 0fc7abb403b00f38240fddb63422165de6f8dbf6985d849824db44aa09056195
font_02_sfnt_off000151cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1