Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2d68d9f550faee…

MALICIOUS

PDF

73.9 KB Created: 2021-07-03 05:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5fa13f1d5f473a6db338b76794135aec SHA-1: 0249520cb2b0c888f81d9ecc43c2b339f8911c27 SHA-256: 3c2d68d9f550faee171ec76e87635fd92f7cdad1bddcab2ab2d26d96ebd09250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or further malware downloads. The presence of external URIs and link farms on compromised CMS uploads suggests a tactic to distribute malicious content through various deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=core+science+stage+4+answers PDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c57df776aafa6e9a77ae5849ae673ba1/16160648970.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ba8655e43efb3e77fff3f83534d27e27/piwusazibi.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/25991489706.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54fb90cb6---kokasugafe.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/9684654796.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/32788338655.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e15ce569---96367470923.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/tuganekajofa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79af52ac0---pedetiluvufuse.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/odo9175nlc5ukmd5fjlvc3dodp/72655834014.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/30280267767.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1t6akeu2ni6t01qmk1p8a37574/mevivuv.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f5e0bf84---timufu.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/63863809333.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/93324891018.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497cb2d8aa---gisolimosaw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6db49ef69c029d01b0eae124a691a733/zokenoji.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/992e5fb63282e9cc2f5318db5f7e842e/refezigaponerowavasigasut.pdfIn PDF document text
    • http://gabortech.comadmin/file/85766727137.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/763fcc71b09a082c6bc005384d05bc1f/29191863303.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/tisenijamegorelatosejani.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/88387422705.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/61217048551.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1fqdilgm3ro2ieoi8f84aso492/84902853575.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/nonimix.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_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 16476 bytes
SHA-256: c2f4b8637876f0633e62f1246252a2b57e36bada86a73c915400c103d64375e9
font_01_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10552 bytes
SHA-256: 2bc224d307ce66966cbe8dda8a552f130b80643ee28c0aa43bb558828b778bbe
font_02_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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