Malicious PDF — malware analysis report

Static analysis result for SHA-256 60eda8ff8c7b7316…

MALICIOUS

PDF

80.7 KB Created: 2021-07-04 00:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0dfc33c2f315b4648c38e5e0b1f73731 SHA-1: 3df3b5af0fe4aadbb79dcd91a48e636e68b8b806 SHA-256: 60eda8ff8c7b73161b4b9b0f94169faf05e1e9be10ae5df6b1f5aceb9f3defcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://steklo-shik.ru/userfiles/file/65485842902.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245cff22f0---54050226780.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/50356738227.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/36005697685.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/64254644673.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/16971853528.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/26317177856.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070955e04793---93710466304.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/xavuzilesusaduz.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9d8d30560f4783ec4cdfd958b195e166/wuxejawebivopedonev.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4e702a8c---tasowogisofowaliwito.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a49e032ea---23907491940.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083289e623a9---59745783453.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16074487718c64---dazesavela.pdfIn PDF document text
    • http://abnicum.com/files/file/81782501972.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nhiddqirampa6ie88liffb8vg0/19064208165.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/popanimizalekek.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/49109962384.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786170e7c73---zevatixatifemi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/deritebafu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/15432153990.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/kobigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=paul+washer+knowing+the+living+godPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011975.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11975 17324 bytes
SHA-256: 1a75c1d7c3f4430d1cd840f96065a8c79172e5b9f76b1bba559d28d13521bb4f
font_00_sfnt_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 10872 bytes
SHA-256: b0b4f47b0f6bd59f9482007a20ba9e37e07e4dea9abb67e73ddff87048a90458
font_02_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 17560 bytes
SHA-256: 24c658d36d959f20b9b5673b0821764e96ca67ff1f1861bc7a720a1e855d4ceb

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