Malicious PDF — malware analysis report

Static analysis result for SHA-256 79de7cbdf40f685d…

MALICIOUS

PDF

76.2 KB Created: 2021-08-14 00:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc00af6fa9cc147029cf4d6bb2c91e54 SHA-1: 0f816cf27996a659d0b630ed648922efd30a092c SHA-256: 79de7cbdf40f685d016e4be0948efc8d7e733f40ca58f0efa6f75b4c82e382ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of external URIs and compromised CMS upload links indicates a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=2019+ford+ranger+raptor+grill+install PDF link annotation
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e89728549---zapuvul.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/47143960444.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/75078802261.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/sirudu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/igli1nica5sir9uam388fn93b3/99430338832.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3661a9fe7---dodix.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/70684027240.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8d0072bfb16ebc8a8fc654750f7a5c68/2207103480.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/c6jhsksb30vd0ctkhkujggo6d6/41479389110.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/83981698837.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/c81ql378jfle3a5rj37fsa6nqb/nutaguwazezigob.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0920b26650d2e00e3aea2783e50aff04/48685069381.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/57962229314.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5n680momcfrjqsue11bme949p2/kamoguxofufidopazasodafil.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/figowomarafofuzi.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/foronumulubodu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7999226c---gusisunoseterefupofu.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/83736867496.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r7qoeb30f95dm2d7c57qcgto77/46338562635.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a82147e8680---13454811672.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/xapebuwofisebali.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/pisimuvuja.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be1ed83b670---mubuvugo.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/jamipegudenukofasutatil.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_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 17224 bytes
SHA-256: 9d5b09e4e31429dd12fff2cf68602a846878b35a8b7c6326027b02a9a5050088
font_02_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 11036 bytes
SHA-256: 5b99ba708f59a928a9a5796b790b9ef4e9e557f5ea68b52c2db3442ff4617bfa

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