Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9142fbf55bb7048…

MALICIOUS

PDF

93.6 KB Created: 2021-06-29 13:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c942363819b773009bf943573836453 SHA-1: 623e524dd881901488e4b977e2de7d16ad6ce326 SHA-256: e9142fbf55bb7048a4ee78b0c973b11d15e54a42cb92377e6236c784cbfdaf4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://medvor.ru/uplcv?utm_term=differential+calculus+problems+with+solution+pdf PDF link annotation
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/7873a3365d5bc1d96b58a21c44778642/mapejifad.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///52718461745.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c591f2e33---11037806753.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d52e0ba0---tininorikotokugelimag.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1426b126---kagikixelaruw.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/320ce4260b679fd53ef846d212d84dbd/sevufawovotoma.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9a079a88f2d22600f754c8b6f1606a34/86595872842.pdfIn PDF document text
    • http://askort.pl/Upload/file/67695130639.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/popivevotiwaseridemibemam.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/nunakisujajujotufojezixuz.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28e2de93c---44446244469.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa0c17de56---zivedajoxevapubilik.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3f0f3b8811ad42d39f62fb4e30249cc1/23317723729.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqreekfcc4lhr4tbp8bku7h8i2/luruzajavoxilitem.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xaxemerisi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3bafdfc1111abd9f176d2015d2648427/74908198106.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/afe4283ecbecab2f599a6246c1f045cd/detetigotixiselo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/29a73c93a6189ffa602666d8c8bad34c/vokewovazugifurali.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dbe8aab0acbe0e963a8898da731991ce/lenoko.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770b6bb18a---26860276554.pdfIn PDF document text
    • http://techbis.pl/files/file/tusudakudoxofag.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/16541898800.pdfIn PDF document text
    • http://agrion.org/upload/fichier/legurarigigazovij.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wiwurozosed.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 17104 bytes
SHA-256: beb92a5e00ab353fb4be6346a93f292f768767edbf885cba35740abea3ad1cdd
font_02_sfnt_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 11212 bytes
SHA-256: ec281c8047f2fa5dae6885fd7c9ad15498ebc55a9f674a8beaafa304c626ac91
font_03_sfnt_off000152d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D2 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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