Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b43ae415b4d2c60…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 07:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b604a2f14be8d4621339ad00d2ba53d SHA-1: 3ce04a55e34ea91b724f689dac6c86fd7a580556 SHA-256: 6b43ae415b4d2c6025cae3da57d6d0c9ce90ca904e7603a318de3b064b5d3803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/asjcrumr01b9inc0bke53oaqf0/39601697041.pdf In PDF document text
    • http://hayatteknoloji.com/webimage/file/43764134585.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/15373443738.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28efd18b81---14805081288.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210809172943.pdfIn PDF document text
    • http://www.delaneyllc.com/ckfinder/userfiles/files/momenomusizubozovoduxonus.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/vonuminikewikodosab.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/3299157385.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/82939129063.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f35cbd9e3153f97364cafd0da7e8c1ae/89684205595.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/77869955478.pdfIn PDF document text
    • http://thaide.org/userfiles/file/10848027407.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/a9dfa3f1fd5569001bf0306239474606/norakuxo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/34465197968.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb9529669---topir.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/58006992802.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/juxatifaromajasel.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/85326717927.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/raretoweduko.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/84099665435.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb2961c63a---rafikusone.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/67952044634.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5e20a9ae---94399920187.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/90050117385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=operational+characteristics+of+an+electronically+controlled+manual+transmission%2FtransaxlePDF 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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 17408 bytes
SHA-256: e66abdf8312fd3900f1d7a8c918b7d19f0d8c91f7a539b69072d3e89a479d8d9
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 11260 bytes
SHA-256: bfb4829250f0f89831729f49417474585995e503d3e4fa81104363b6b1ddb2c1

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