Malicious PDF — malware analysis report

Static analysis result for SHA-256 005c1dd65a4f3f9f…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 11:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb81fa649b41e4af2b793363adc350d8 SHA-1: f7d541279ac6bd283d3233dce8c43926f978913f SHA-256: 005c1dd65a4f3f9ff384cdea1695326b0ae83ad7f2299ff3ea636c75dfdbe5ef
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories or disposable domains, suggesting an attempt to lure users to malicious sites for phishing or further infection. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bensonlandscape.com/editorData/file/somunowavanesabilez.pdf In PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/62619921136.pdfIn PDF document text
    • http://edallyshop.com/upload/files/konifumoz.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/23578968862.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/madosewilogovi.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/xisala.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125e71b86901---15852023803.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/rf4chp6ns9m697j8vbkhne7d97/29922096001.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/28763419205.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/roxuvumuvogozafijoloxabo.pdfIn PDF document text
    • http://119pump.net/d/files/841491929.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/04f4c2aa9b0f68255d9ed367da898e3c/pesenerurifukorelopazuz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba8c2a29d---61365242778.pdfIn PDF document text
    • http://wineuniverse.us/userfiles/file/77737054974.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/79214577460.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/59281268116.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8807cf3e09---25491694398.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c5d38058def7942de786f9713015e113/65308637681.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/97449415772.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/tuwizirorofowawolefi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/17da70ee9383ca4b2ad223cd30e4aed3/posewuwefanumodumoruxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+force+that+through+the+green+fuse+drives+the+flowerPDF 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_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 22652 bytes
SHA-256: 3cc94ed251489d17b40995c56e987ee5e2718ce050d49c83edd5dc4041082981
font_01_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 10972 bytes
SHA-256: 65838d13820fd18b93cebad0c06ef526662c13e732d14f0cd9510a3dc16608e8
font_02_sfnt_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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