Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae66236025ec35db…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 14:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2a9b666aaa40ca7616efa466e13f84a SHA-1: 2717bd8c42fd41c4333a99f7ea1ab87085c1a92a SHA-256: ae66236025ec35db48da3af16ea18b997259199ed7d01ab37c1a82eeb321082b
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and a deceptive download button, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing and potential malware delivery scheme.

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://nomylo.ru/uplcv?utm_term=thinking+in+java+free+pdf PDF link annotation
    • http://studiosimonepantaleo.it/userfiles/files/22207573225.pdfIn PDF document text
    • https://andrejc.si/files/file/faluru.pdfIn PDF document text
    • https://migger.dk/userimages/file/24896951300.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/geled.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/foxiputazataxigidi.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/38314780880.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/kavobafuma.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/65a3c87c22d0d9ff8e1000aad08cce52/55910468773.pdfIn PDF document text
    • http://grupophi.es/uploads/files/2501109964.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zixatogodivuvakugubij.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210915172708.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/41737054334.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/baxafelaxagun.pdfIn PDF document text
    • https://tavio.ru/files/file/25381745205.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/55863803012.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/todonowixukugazo.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/difunawududapufemexebute.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2fccd85e---zoxenobudofexejevora.pdfIn PDF document text
    • http://poliinc.com/upload/files/rosudajo.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/tozebudunelitaxe.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/dexuwepuxogolebaw.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/982fa8bbbe63cd0840cda3b93b04ceb1/67909837299.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/38591831074.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/gameporazo.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_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 10596 bytes
SHA-256: 8809ab0331c951d65f7328c5f12a2bff6ea2eabbd47e5e82d203ff72d33c4fdf
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 18512 bytes
SHA-256: 368a7e6809a78dfa5fab34cbd2b69cee2765c53e2aaa1d38573462d34c1d72f5

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