Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aaf26c6ecf1f22…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 17:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2016861b3a8531f53d2325418da04e14 SHA-1: 2abfb8093c5b59f8dbb82b172183637bfeee2a59 SHA-256: a1aaf26c6ecf1f22a0efb1a35772f5f568461bc23331c921b15a7df076279138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains, such as https://allytemp.ru/uplcv?utm_term=show+me+my+phone+settings. The presence of embedded URLs and the overall structure suggest an attempt to phish for information or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=show+me+my+phone+settings PDF link annotation
    • https://coebmsf.com/userfiles/file/tedaxaworiliboxawogovape.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/sozaxetanolozaxe.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613215bce9696---91927529518.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/85165065487.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/dd4b35d25ffcc6d22b68e7c426df74a5/muvopazogunobuv.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/zedapabazu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb0931b56---3321025487.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/mebaludejuwasudapuj.pdfIn PDF document text
    • http://pileki.com/imgup/file/vomobuvewutabijotimi.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/99012713083.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/31245239687.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/rujudukurolijolowovam.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/gesigedunemogizosoja.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/27863275892.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/53649791813.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/78592351315.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/badilaj.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/roruguti.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/88758676171.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d20cd1ebe---92871481519.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/10869344898.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e88e8a1ec---9804342231.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/zulasobijitifesuvulexet.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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 10664 bytes
SHA-256: 9a5d75e121215462312b081309f7f3d1a998f60e2a70b18be9f060b523bce6b2
font_02_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 16404 bytes
SHA-256: be8080abca8d1a06a81be05a8427ab34f33674ee540241de6bc6df28c67af34f

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