Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a50a2c55fe583c…

MALICIOUS

PDF

84.3 KB Created: 2021-10-09 23:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 283e700dc40f2255ce2af7adfa84eae0 SHA-1: c092c2dbe90c1092f0219f5a237adcdaff9d6228 SHA-256: c6a50a2c55fe583c79a7b7f081a0d801f0708aa694b03d82539bf8f154ff4ec6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those on disposable hosting, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=tattoo+lettering+styles+generator PDF link annotation
    • http://e-menu.hu/editor_up/40389008406.pdfIn PDF document text
    • http://full814.com/upload/files/runekiba.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/88773343963.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd425fbda---ladenu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/xizawomamaxilulepatone.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/junapogixulurogom.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/62487414578.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/39299879729.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7a4d11bd---55878686592.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/66100121771.pdfIn PDF document text
    • http://vhshf.de/File/lofadufuwijopakixeveb.pdfIn PDF document text
    • https://okazionche.com/files/42132902299.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/dunafuf.pdfIn PDF document text
    • https://kristinanamaste.eu/files/1658434190.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210918_105757.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/sang7c3u6mnrvih2antl55pla7/96220713254.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/24579204532.pdfIn PDF document text
    • http://keramann.ru/uploads/files/89916416695.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/82574668806.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/fosataxazexuxojajobuvev.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/73489375370.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/30466227541.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/38920338730.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210916/16317551376765.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 20024 bytes
SHA-256: 1fcb25efbf7da34a6e9eccb39fcb068e4c86c7ddaab63f187bbd38d65eb34c7a
font_01_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 10360 bytes
SHA-256: 553ceccd9c44a25201d16355472d0cce2e7b57eecc23385f42023c8037c27169
font_02_sfnt_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1