Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f733f521617438e…

MALICIOUS

PDF

162.1 KB Created: 2021-07-07 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1fc58e688c3a3b62594bb5cd191d9c47 SHA-1: 86f72500ce9a0e83119a2220266384b3bbfc9359 SHA-256: 3f733f521617438e902c241836971a87f290d3d0050af509b495d3158e9adac3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. This behavior is indicative of a link farm designed to direct users to malicious content, likely phishing pages or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d746584d39bafca3e272b96bf277ccae/96047623413.pdf In PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vurizofudilenej.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c3f9ec53---95459589855.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9b9b0cdd---48849654916.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/18618236072.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f8e5fa2a---72704143309.pdfIn PDF document text
    • http://askort.pl/Upload/file/51551174887.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd503be85b7---borege.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607589dc79f85---17035874933.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/pokowejemet.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d19474d4b---reniban.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/19468669707.pdfIn PDF document text
    • http://www.asslar.de/downloads/3609079134.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad0b4cc60---dexuwepoxesibiruzopatokaj.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/wulironaxozorofobizopozup.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a4737dbff24922a6dc2deb5e973f42fc/31879669273.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b93d4039---48451356272.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/20450862848.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/sesafor.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fff74ef33---42075877260.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/webajifazujiz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8aa60925e---96805725997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=work+out+for+mePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F487 19288 bytes
SHA-256: 875eb159596b0f384b3b9badd796d2630d51aa5aed1c086de5f6c27ea94240b0
font_01_sfnt_off00021567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D7D 9988 bytes
SHA-256: 00273658bdd70f131ec359dfef9b90080955f809d354f566f001460d105a2d45
font_03_sfnt_off000243b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243B7 21548 bytes
SHA-256: 9f6d8ef59edb2c0fa3ba77800d067ea086323f8acc660c5aed7df7530a2663c4

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