Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74750bd55d48281…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 11:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bc878ece1d6bb820672d9bdc1eebc765 SHA-1: eb577aca58f9c939fcf5396b1aa830004cfbd5e2 SHA-256: a74750bd55d48281d1c6554917f4644ce297b60a5cbc6529defd4913b3c3206e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://drafthe.ru/uplcv?utm_term=pdf+reader+voice+android PDF link annotation
    • http://nb-magnet.com/upload/files/vexupogolusin.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/fudirowebarul.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148333c57c84---84396675443.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161520eda2c590---40846399429.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/3781851657.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/wusejoz.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa331336dd---1832109163.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/mupor.pdfIn PDF document text
    • http://ustunongel.com/image/files/62564306351.pdfIn PDF document text
    • http://candientushinko.com/images/file/64201599432.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/93999431153.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/sodonovuz.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/b90ldcshht8926rab2rdkpgar3/83104359949.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/lurufutefe.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/gunupaw.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wifexovalep.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109251253322110.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/593c1ebf28c41fd3fbe60cebe658f379/guzuvegopuvomefubonisi.pdfIn PDF document text
    • https://guitarenko.fr/img/files/77217638795.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/nuwuziviloxawisovuxobori.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/72788059608.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210916020612_343740.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/5465770845.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/36452006654.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/62758666946.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/57886004695.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/43059840831.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/45880808664.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_off0000b69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69F 17252 bytes
SHA-256: 1db0f8158bce0c2352a657ab3c40f507a65be78d0470d38f562ffed9b3c9f15e
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10224 bytes
SHA-256: 2346c11f437723885dc1a1873abfcbf18ef8a50bb4e2091b698786908953d1e7

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