Malicious PDF — malware analysis report

Static analysis result for SHA-256 8162cb815221b4e3…

MALICIOUS

PDF

74.0 KB Created: 2021-08-31 07:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4a7b6823ceecf3815653d46166e9a93 SHA-1: 1f3571c38cfee34b568c297bb75b5d6f165259c3 SHA-256: 8162cb815221b4e3537188e7fcf277c921ab1486575be10097e8ec848baf849b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://clove7.com/userfiles/file/45130622146.pdf In PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/18199998163.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb12fe164d40b779a1e624c6600a227b/fefilukofejubuk.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adca824cf35---xobeso.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/7bjfad6l5rvecok2iih89f9m9h/84746423280.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/suwixo.pdfIn PDF document text
    • http://duralinealu.com/upload/files/gopef.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rifen.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210708045135.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/defogowugamil.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lopobonorazutojamasoxuri.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/boxodoxuwilegax.pdfIn PDF document text
    • http://rayanchem.com/d/files/99838973566.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/5116030720.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/40893659960.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a10e82c54c---wofemijuni.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/repamuzejorire.pdfIn PDF document text
    • http://chinazzjx.com/d/files/jipajafagederesamafolone.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/41003926508.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51bf2b9be---bipifujisekot.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/38709796244.pdfIn PDF document text
    • https://dm288.com/slicice/file/37927609523.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/37680736077.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210715174526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=c+11+compiler+linuxPDF 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_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 16068 bytes
SHA-256: bff3266b7aa347d1936e9a6f936367e2be08d4a629e0c35483e8b79d9916d621
font_01_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10392 bytes
SHA-256: 7fba2b80d25127d66fd6a6075d40d20bfbf192a981099d113177a78b7c04b81e

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