Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac115112eb84314e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 01:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d4bb603d7636d57f415075e0c0e94bba SHA-1: 6681dd9d2bb9820960bb053a894dd198c63cc7bb SHA-256: ac115112eb84314e261d5ea4c5370e989794f9cd6368ed5c2c1f5d9759dbee52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains numerous links to external websites, many of which appear to be part of link farms or hosted on compromised CMS platforms. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=happy+mods+app PDF link annotation
    • https://barrier.exma.cl/ckfinder/userfiles/files/73871548311.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/946738e69f667c31905d605d7a6fcf53/32594479119.pdfIn PDF document text
    • https://guijek.com/userfiles/file/43508218159.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/29181096999.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903135325607242.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/vekud.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a247c5a79c---kisodajawixeli.pdfIn PDF document text
    • http://effekt-film.de/files/file/pupog.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/43274771686.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/73366980370.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/vajokibefagituxopix.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3a7a8ee08d4158496b0da2935f036710/65068200639.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/molud.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/belitafumififirexu.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/nufofigemivelegos.pdfIn PDF document text
    • http://klaaswester.nl/img/file/fanelafipavazugedo.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/gixusuxumomapazibogoma.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/33032421018.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///55356884724.pdfIn PDF document text
    • https://checkmavandon.com/asset/site/files/dosetijanimulewelediked.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631235003775976066.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/xufufe.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/xibiri.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/mavutupulovabekew.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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 18516 bytes
SHA-256: 1158a79d1f512aad32966438c4a6c08bddb6d94575405e8b3858f7fd26f5deb4
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 10088 bytes
SHA-256: e1c933726f2e9152c5a290b324bf6f6b083599337b7d95cb9f02ee762ffc7fd6

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