Malicious PDF — malware analysis report

Static analysis result for SHA-256 85232b717d0830cc…

MALICIOUS

PDF

74.9 KB Created: 2021-06-29 23:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dae73059bc4cb870fed1e483f5b7e1a5 SHA-1: 94edc37fb2f7e818ce3439762709765255c5aa1c SHA-256: 85232b717d0830ccc8d40cfa5a6a7ae06e5343b92db0e8f4545fd8aac8270e98
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 redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://addsfly.com/userfiles/file/pufekalor.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e612691dd8---18685867451.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/80588544876.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a709f77111d5aff9a2ade6eafae41095/nexejibirexufava.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jamefuwur.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/sarof.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/88a3a22b9465669706d45639c66980d0/zesodobidatifite.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xewulopubekalexo.pdfIn PDF document text
    • http://uco-kampen.com/media/files/regojejixafinazejuwexexud.pdfIn PDF document text
    • https://rajakedua.com/contents//files/35036180033.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/giwamoz.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/dasujawoguvodevuxokipet.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885fc9d4dbd---rigediwidinibu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec330ec80---27937204645.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/fufimirosafupimure.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/87857281800.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/30338425206.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955b3e4eb---81845785781.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8823a6a11---38733194422.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/gafobenitojubis.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c11fd9838c1---pozividigu.pdfIn PDF document text
    • http://russia-ex.com/gofexor.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/tefovebupaget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=brought+it+onPDF 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_off0000bf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10032 bytes
SHA-256: fa6dddd93fb4c6b8a52124f114a1cb12a4147e5e694c2ea9aad459abade7f0d3
font_02_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 19032 bytes
SHA-256: 612d86f6837bcd9713710a6ed7398907f1b7bc8472aaeb7fca26d3339542a8f9

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