Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd685971f407d53b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 16:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d20ef13677ec0fa0accb09ccef93176 SHA-1: a651e0b20d64ab2cca248bf5b3b4e1a472bb7681 SHA-256: fd685971f407d53b4ef7a69d931c75442a054e559dbe49a2bcaaaea39404e363
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were directly extracted, the nature of the URLs and the detection indicate a likely attempt to exploit vulnerabilities or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=standard+form+to+general+form+parabola PDF link annotation
    • https://castilloexterior.org/ckfinder/userfiles/files/99301652781.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/5169826685.pdfIn PDF document text
    • https://hse.tw/upload/file/67346995301.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb54ab5148---navusuwitirip.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9d08fef42fabf8cf028fbaa468ce223f/51970185029.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/pawekonabalu.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/70625428622.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/55852374025.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f09ef8fd329fa35b933ba9dc35122590/sowujunetejemi.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/nonefi.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/55000812467.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dujekanuzuj.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/30120460184.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349d2b43fa---renukasejowogorarekiwezir.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/38209234951.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/zutewabolijezaxew.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/batazifajimaxuxopezemof.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/40606255913.pdfIn PDF document text
    • http://cataga.de/beta/files/file/xovoxupivoxuponid.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/zawebowu.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/98493539236.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/33178024116.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/sumomevadafajowixesoruku.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/nivagevejobatavulisa.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_off0000affd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFD 10796 bytes
SHA-256: 6ef6e400e972a54f8b8c935794abab9ee23a330a3a302aafa5136224aa668102
font_01_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 15696 bytes
SHA-256: 3bffa4915782bcee4d930c909d08c1c5fa191dec534ae202b67dfd9f580d1fa4

Open this report in the interactive analyzer, or submit your own file for analysis.