Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c274442efa255e2…

MALICIOUS

PDF

84.1 KB Created: 2021-07-06 16:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 492d44c4a3ce597e776da86d8e31f8b9 SHA-1: 03608f6ce6103824e311f878ff32e2b836a9a3c3 SHA-256: 4c274442efa255e29148710ac65809d429bc04229fe705b47368fc4efc5f385e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised WordPress sites. The primary attack pattern involves luring users to potentially malicious external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://daydreamspin.com/userfiles/file/97105302899.pdf In PDF document text
    • http://giwajib.com/ckfinder/userfiles/files/vomafezitesalovifuvibuwap.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/40311742068.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/luvazijipumomemaribox.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/895008c9ae5771aa056d2420fdd06954/5479364174.pdfIn PDF document text
    • http://sooclose.eu/upload/File/zukevebutapepalekuk.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/takakigoziriwuvetavevode.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/fevaxeluz.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb217c48f---89924402078.pdfIn PDF document text
    • https://ekransamara.ru/files/warefipusidoxal.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17ae7219b---23879502237.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/9668705506.pdfIn PDF document text
    • https://doganagolosa.it/file/xelusufeguragowosaj.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8a029ec31b243cedf1d8b832084bdf0c/mufetupoximepub.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2lrs2ctt2vvpgbvu4qovv01212/lizejuwijirovodizav.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/87956646035.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704fc5ca328---23912933448.pdfIn PDF document text
    • http://industrialdevices.in/uploads/fufedezakuzotopezuxere.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd7e3c95a---49503892520.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4j4mdflcab4a71kbrbeiimnamk/270907534.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097423bb3c0d---majafigebuxojeje.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/afaeaca71fc4c49e238c31788b1aca49/godanokufixupepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=quick+question+in+spanishPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 18792 bytes
SHA-256: e1ee6441128ac8059e1087c2d36c66f05cfc968e1bf3d3c31da5156f4018943b
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 10724 bytes
SHA-256: 81ab067ee728f7d5b69bb1af5128b2175c03f73f30b4867e30cc842d968060fc

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