Malicious PDF — malware analysis report

Static analysis result for SHA-256 0712643e3b636d1d…

MALICIOUS

PDF

100.5 KB Created: 2021-08-08 11:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1e0e31305e2d36fad627acd9b8eb953 SHA-1: 2ea8dbe1c61b680daf4560833893326ca8d6da04 SHA-256: 0712643e3b636d1d2ec9acb204011dca334504a1d9898e9ba232a05bb6595beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous external URLs, some hosted on compromised CMS uploads and disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://detskeihriska.eu/ckfinder/userfiles/files/kelasiposafokokavugalivu.pdf In PDF document text
    • http://gdgom.com/upload/file/210618140135415902a191yioypi89.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/wovoda.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/wewatininizogebaxuzok.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/8v9vblhrnvqmsbe5lvi4c035v0/xulosaruge.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/58448679495.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814690a959b---14988655359.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/123326368.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/57927350682.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/fogubikabinidelok.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c062a7d3---4077181749.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5eld4q0lg0v05vagb3faoa22rk/45030777129.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/205e55c37f1409fe3655a783419f320e/dolokesobikarajuxixotike.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/pufozadofetijitix.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/gerenejudu.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021761813228136.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/vezubi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/gobozufan.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e2b05406a1b0487919bf1da01b4501fd/dejexob.pdfIn PDF document text
    • https://everestart.com/images/stories/file/76713219114.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/48f0c60cebc6a319f5f8304cfa02600d/sanukesizosezuvefis.pdfIn PDF document text
    • http://hotstamping.pl/files/file/47551465217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=learning+javascript+data+structures+and+algorithms+githubPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 12668 bytes
SHA-256: 26b9e3ff0c05c1d84a3043530dfedfd674e6ab495352d78410be8c7df6d1a2f3
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 19492 bytes
SHA-256: fb5606e7d90a68eaf9460d0a3e0e000558fa04df3a0a93ef336581745540da55
font_03_sfnt_off0001513f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513F 16480 bytes
SHA-256: fb2939770094e24390dfffe27bdc2e0cd42bfcbc8d88d4f4b9ee3242ddea019c
font_04_sfnt_off00016802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16802 11356 bytes
SHA-256: 9c05bff6f37852c07452c17d66ae153ca98d622a1a9803a0cee8b2df4ccf7ea9

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