Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b0a6731633c17b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 10:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ad14e284dd3f2daaf4d651fa6f5c526 SHA-1: 91c69772c61f6b6bcd6fb73bdd5cc34918b504f6 SHA-256: d9b0a6731633c17b759fe5ef06de3d6c39a4611e5d8727ee6cb132f744036c9b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress sites and one directly to an IP address, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://indianspringhomes.net/userfiles/files/kinifunagubobaru.pdf In PDF document text
    • https://thinkhigh-tech.com/d/files/fidasaz.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/404022c36570dd656046977bc8857ed3/jivaleg.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/70702101264.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/44426267970.pdfIn PDF document text
    • https://aneri12.eu/res/file/82936214379.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/tonafinowivijejefeviz.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/34313615639.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/18019124577.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/793595f3a9ab67ea222a7e5b090b8750/zubimedeka.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5281b72ff92041d31c55f85d79b51a88/pewifim.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/32599634091.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf974e1218---58752038645.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef8c0a536---birokujezuzememiju.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wokema.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/gosogetimesuxomax.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e167b65dc---8021915675.pdfPDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/71cb122391068c4a61d7bd91d420adb1/bovalimezobesudora.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782e5d46eb---lumola.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/24270544526.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39771215780.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1629423539/files/bonotikagevuwujozogazo.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/sj047cg7jm2e42hjh8g8vnmc7g/dikizem.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607991cc627dc---zojegaluwevonofaj.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8016d3b78---bowonuvigolijifevuzejobig.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64685000649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=one+period+dividend+discount+modelPDF 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_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 16196 bytes
SHA-256: 735d3a630e0a500ee772b0cd1c805544345e6cab7706f546d2f701bf4d681746
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10704 bytes
SHA-256: 4367b777d9a6ff12f9caa2afd61b00f560d794f8ce46feeaa1a706f36e771e05
font_02_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1