Malicious PDF — malware analysis report

Static analysis result for SHA-256 684f6aefcf47030b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-28 21:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: af0a3a4e5f76c071d045eb6a79dfe5f4 SHA-1: 5dc48eac04997205c5b25353e7e9dcb90e3e4876 SHA-256: 684f6aefcf47030b020c705a5287e3e8b1e589534f981f8271ec3c9bdbd212c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. Numerous embedded URLs point to compromised websites and link farms, suggesting a tactic to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_LOLBIN_RUN_COMMAND heuristics further supports the malicious intent of hosting numerous links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://drafthe.ru/uplcv?utm_term=delete+dcim+thumbnails+folder PDF link annotation
    • https://gs-hemeringen.de/ablage/userfiles/files/baramizewekujuvobixamivos.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nj8kufdsf84hirnahojs9lcg98/61609402332.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161535b225fbc7---dobezupajefusojizig.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/98932560144.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/73889436481.pdfIn PDF document text
    • https://socardan.com/userfiles/files/rexafulijutobose.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/kajudikavewirugumam.pdfIn macro / runtime command snippet
    • http://honeystraw.com/uploadfiles/file/84365411394.pdfIn macro / runtime command snippet
    • https://motodubai.com/uploaded_images/files/68031444979.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/jemegurigelidarixibav.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/41524558297.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/nuzeroxikumejud.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/nobibezivoboke.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/serarilugudin.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e3d5bfb79b2775f0a21dcc6907fa56d8/mubama.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b81935ce6---birejelarabug.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/50990860432.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/60082571058.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/pupizijuwakajuwanoguki.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/poridese.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210910015750490.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/11622083694.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1db26757---11843550685.pdfIn PDF document text
    • https://socardan.com/usIn macro / runtime command snippet
    • 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_off0000b86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 19080 bytes
SHA-256: 8fd13cb0ef16cf0757d725fb9a6e625953608298ebaa9171f34d21588a07c07e
font_02_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 10980 bytes
SHA-256: f26d4e78f50f45679201c96528f6c1138f7361a44da921b0830a00accca427fb

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