Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee144449cfb9d71a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 14:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 801c178d18a61e5800d09f6f6e9f1fa2 SHA-1: 5b35702a6506f0ac2e1bce27de1ba69ea1e69e2a SHA-256: ee144449cfb9d71af8df68656152e5a7cdc89ff5718ff7266850254e5743a749
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://shippingengineering.com/files/ckeditorothers/nigalijejojalunafuw.pdf In PDF document text
    • http://studiozoppini.com/userfiles/files/jatododorafamelara.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/9254542438.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tvd2rc41rg0vfgt2g929b6qbg7/melubelovedemilalemases.pdfIn PDF document text
    • http://sushibelovo.ru/files/zukari.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/71795812883.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/64517046137.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/45788305187.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/nibuk.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904022854.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/naradodidetaxetus.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210909191229.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/sivelipakigoxobimijori.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/rikekexebesitasomuvi.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/63857790334.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84a5a4802---belodozebebekazefeb.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/89336169625.pdfIn PDF document text
    • http://ymmicro.com/files/files/womuwisatemirifan.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/78610290598.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/41239329689.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/04e7ded18a818b166c25d59d92af778a/rawutarobogetilawowabedof.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/65821977983.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tufisenubasirenuzuled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=alfred+android+appPDF link annotation
    • 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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 18056 bytes
SHA-256: c862076d4372095ba3ebc2c8b90e9f1c85880a9bf0934b1e43e9c8f316b5e39b
font_01_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10204 bytes
SHA-256: 6b9c82f34ab7fad2d5dab75315208596588708ef7f4bd3951eee382f5aa8451d
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1