Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd53eed5315862f…

MALICIOUS

PDF

90.2 KB Created: 2021-07-23 00:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd1a969e2288d2cc6ee3b10803fc582c SHA-1: 57f05dee1fbf58ed816fcd090f8b2c13c86106c4 SHA-256: 1cd53eed5315862f3a72c8ec4d95dc2a36ef49870be7b05318fc91cd12fcfe54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised websites. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are hosted on various domains, some of which appear to be compromised CMS uploads. The presence of numerous external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/be9a7533fd906d642cede74ce6d361fd/xokejolonadonezalop.pdf In PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/gefim.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f08bf105a---sogunemofovisapo.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/18930083238.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/rikemumewufemutex.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/77834218968.pdfIn PDF document text
    • http://uci.ir/userfiles/file/68079408706.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/44199999182.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a968289b39c---52615793752.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/h8amj4a0tlav2ap270hmnc0hb9/jigipuzalujomajasizonuvaw.pdfIn PDF document text
    • http://museeducuir.org/upload/files/bubameza.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c935df8d4b4---46215656404.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/tijefomibekoxatalisubade.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/pabekukepiga.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/botuwigefimetugep.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/zuxoguwusiwanigadijenu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c620d61f59e---gikoxufonowoxuxikomido.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/2586734285.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ba09bec0---11741583529.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967ff79a3d0---24209328127.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/66648412309.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/191e935b72c1b30d0e3fc2e983962ebb/59175156587.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c1445474---zaruwepijefoworiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=eagle+creek+trail+henry+cowellPDF 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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 17824 bytes
SHA-256: a92c13ddcfd1d68f0ba3af87e486414dec62d63edef3f0752859000078cca53c
font_01_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 10616 bytes
SHA-256: b71c5874bb9c6bc6b8069f90f6bab93a14cddebc16093663710015b3b9f01e46
font_02_sfnt_off00014295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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