Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bee2d510c9892ef…

MALICIOUS

PDF

71.4 KB Created: 2021-09-01 14:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 47bee62d19cecd05d5e7b97cbef21cbb SHA-1: b8d11877140c14a63dfc0fbb59bf61433f97eed1 SHA-256: 8bee2d510c9892ef7efcfe97b559ac47f8177c8efc96ebad02d9bbbd620eb91e
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 compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/1484748056.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/adff1c8a1fa3b121b3f78f95b4438747/54324608853.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ba94163c---mizuwukatajelajip.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/delex.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d6602bd3cef6ef4637e0acd0538716f0/dugedov.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/42958020237.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/24574158075.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/zojerevapejapupopite.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sv2d74t33j773jhqqukf8k3bpj/wapegenenixutejoja.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070311211861.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/30584823413.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/19316726811.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/kelemidabiwuxogo.pdfIn PDF document text
    • https://fotovipvercelli.it/file/20346610893.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/vixoto.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/af22c6ab6ab7e6dc224735a80ab656a4/jotarinarozodiperikewip.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d3d9f6dc---18648479566.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/61896400595.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/88r6b9h2sjq5eit49f0cs5c9ib/28725012498.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/56419206854.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/95531171401.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/33953126952.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/55eokpdq8vvpp4ddrtkbogb69q/ratikazi.pdfIn PDF document text
    • https://patc.fr/imagesfile/52778431062.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vurunitidunugexisexanixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=these+are+questions+that+are+not+supposed+to+be+answeredPDF 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_off0000b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB664 15852 bytes
SHA-256: 3097673567b1970e17c5b42d9d98d1b0b00c0cddaa5688096d6bc58306e6f8e3
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10880 bytes
SHA-256: 419a64d6bc93753242a55a8afd7368077a7d86b6fcc565dd785da25db212cb45

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