Malicious PDF — malware analysis report

Static analysis result for SHA-256 f664f0be24fff373…

MALICIOUS

PDF

87.1 KB Created: 2021-07-28 02:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d174b7e5d9eaa9bb69b0f0cae864705 SHA-1: 5f295edfff211e3e779419ad3819e623dd45b8ef SHA-256: f664f0be24fff3733b0b6f114c1d5d511cea29ac957694a51dae11bf5408c010
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864a726b5ce---14058890948.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa1f2286b---fetuwaxadegisisozulate.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/1858003834.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8bed9f82a2dcda6803f0318b51b264c/81719269533.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0cd7380ec78670c81bdebcae1aa7bde6/41974090226.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/77353288174.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///78550338717.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/46627040033.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/43bd205f4b0b38aed7814f0acaef2617/28888921396.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/vajux.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/bikujerofukusevonu.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/18372684861.pdfIn PDF document text
    • https://isleo.com/i_photos/file/mexodalan.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/71027715755.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/cc6dfbec7179408d3b0ab6457420bb93/49629761261.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3d853249a557b783777ba0b2edfa54b4/sizodibupe.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/30400334775.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nv35nb8b5j93v0mvnm24ekvnc2/84983263781.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2a33a7d89ee9476df0c43c62b64ccfeb/20249726820.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/wadenavivir.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/pawabav.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6df4cece5070d91659766a7c5add002e/logexuwiriwubirafudupoden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+causes+a+twisted+spinePDF 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_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 16288 bytes
SHA-256: 555ac4ccf731e102581552711a86beaddd68f14c47d2bb0514bcce78dc6c90b3
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 10524 bytes
SHA-256: 9529873cf0ff9d8ef73e681503e071f999a380f9f0985091615797e580937f14
font_02_sfnt_off000135e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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