Malicious PDF — malware analysis report

Static analysis result for SHA-256 7603050654613b99…

MALICIOUS

PDF

87.1 KB Created: 2021-08-26 04:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64985ec6188a26ca256f86ea5ae42b38 SHA-1: 41e70895efa594bc55a6dec72605b2fa267f91b7 SHA-256: 7603050654613b9973f74b413831612f62840d5ceba3c6a56136fbfa4e6a9f16
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The file functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories, suggesting a phishing or credential harvesting attempt. The presence of external URIs and link farm characteristics points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.blueoak.fr/image/file/14230084592.pdf In PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/98823938569.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210824063355_nlt6pr.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ui96knc461v3hv29jf46tro0o5/75973495939.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/2013112493.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1fa16e00351018f78c5a196371834a62/86064586260.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/36600024441.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbede58cc9---xaxesixukivoger.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8bf308a59a8c6b6b436dfd0d729bbe7b/90953660253.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/bisibar.pdfIn PDF document text
    • http://fluorescent-training.com/file/78242003045.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a54a4993979---8743577857.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/46808773257.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071f361004b9---nunubomumenakidanaxutola.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kusupifugeginasidizomebar.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060219464280554.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0a0b08963826c49d312c322932c874f8/39208198569.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/613eb388a55705eb9cf1e9939457a3fe/27753926498.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f521ebd1e7---84875803361.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/54223900414.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/13875051366.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7274854db8---39460147793.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26bff3d1d---gevozosanatezawoviwa.pdfIn PDF document text
    • http://fultoys.com/userfiles/gudibutivigon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+sell+houses+on+gta+5+onlinePDF 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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10600 bytes
SHA-256: da6a18d54cedda3e4cc3267a056745122cb4ca2d09626b7aa627ddf8aa2b59d8
font_02_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 16796 bytes
SHA-256: 66a066abafb72d2f78c67c7868a6e047d7cf21cb60389639b6a8bd201373bb72

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