Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ae50d476b74430…

MALICIOUS

PDF

89.1 KB Created: 2021-09-13 18:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0af17a13c751bd250e1ab2d9707b3cf7 SHA-1: add149f202d0a33b4e73e73539c2623c0287e445 SHA-256: 86ae50d476b74430723000a812e780bcae7426ebf33e6becd61ecf822e248d4f
196 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 potentially compromised websites or are structured as link farms. Heuristics indicate a 'PDF link farm points to compromised-WordPress upload storage' and a 'Small PDF is a non-clustered link farm on disposable hosting'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://annabarons.com/files/files/tekejodokoxilatuwesapala.pdf In PDF document text
    • http://marmaraisg.com/images_upload/files/pipiwafitesazevul.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/puxilufabigepin.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/pemutolarutoluwajijebut.pdfIn PDF document text
    • http://besteva.com/upload/files/tikix.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161323b5d0bf03---71408740190.pdfIn PDF document text
    • https://activepymes.com/pub/file/272578151.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/zizazovurelego.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/lewebek.pdfIn PDF document text
    • https://cristalensi.com/public/File/nowevigosune.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/43452459638.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/20924765909.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf98dca55---kivedalifadef.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e168843591faba6e2bc4759b0dc3b6f6/giwokotubebi.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210906065634.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/zibozunuzetewum.pdfIn PDF document text
    • http://esteel.my/userfiles/file/61848249830.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/fomizezinajokisebed.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sikuwiwu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/nififabuj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d134db9f79---vulapefurud.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/64167601358.pdfIn macro / runtime command snippet
    • http://ingatlantv.tv/userfiles/files/82483820776.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/borezupevakuro.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/koxug.pdfIn PDF document text
    • http://www.77ice.com/upload/files/rirasolanadomozekin.pdfIn PDF document text
    • http://www.virtualaid.eu/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dua+for+negativity+and+anxietyPDF 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_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 20536 bytes
SHA-256: 75eebfc4a14bac67bca329f2c28340b4c851f9c8b54e0148c4cbf71aca869199
font_01_sfnt_off00012652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E69 10696 bytes
SHA-256: 6955aabd6c6084d3d0d95a01e6cf2de1b4e5f18fd587707dffbeea3dd881ab58

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