Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa2944d65e117b1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e763be746d7fe1a9eadadc1de8dd6e9 SHA-1: fec72942473a737b3b1b01c821086459febccfc2 SHA-256: bfa2944d65e117b14a4f247a0e0fa02424a84ba36a7ae70f366af8b64570b4f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common techniques for delivering second-stage payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=king+of+apk PDF link annotation
    • https://olterus.org/contents/files/tufipuweruvevavatojigud.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/falebepevosavefek.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/32522603041.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/53740803156.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/9048600249.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/43539977207.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/gazorobiniwof.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66315123804.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109021807449317.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/53468462245.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/59151370678.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/75114337918.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/55412537938.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/6c7c622b6fafb23a93056bd559f9339f.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfe2297a3---zagitakokilipaji.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/aa1cd546cfdf5f1b9dc9bfc34ea9083a/62646411289.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/09ba59fe8acbd4705e45dd23738a6dc9/zorofuvo.pdfIn PDF document text
    • http://rilta.net/userfiles/files/68239069837.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631190931_1.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rfd7kpi2guvni0tofpcig44it2/pazozegevoxomenenufijawer.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/17769869929.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pagaderoso.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/68887214235.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/dozewufeletudigijudupipif.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/pujiro.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/sizusefukagemul.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/nafulalivituze.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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 10072 bytes
SHA-256: ef412934310be9c8ca8a8ce82c13e1a720eb6ee1cc8a425615d14c4b424f79b9
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 17484 bytes
SHA-256: 89852cad862b288dd7ad4f3fee26ac231f86d27c75798680973e2b6b7b529c3d
font_02_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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