Malicious PDF — malware analysis report

Static analysis result for SHA-256 88555fc96717f3e1…

MALICIOUS

PDF

82.9 KB Created: 2021-08-20 21:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73700d21400ff1a87bb0fb6d2efbd5d1 SHA-1: 4076e6dba2251937c71ae1be39c4f47a1fcaf3ad SHA-256: 88555fc96717f3e1104eb01851a6bedc6a032ba6c9f6ced89994fee4441d0e3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/68630153776.pdf In PDF document text
    • http://sakem.org/userfiles/files/nejipox.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4acd1ef5b---jajujorivedilejezogukove.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0b7c7236---tuwenowewawepanenulazal.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160774e609a487---85857467453.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/70652414175.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d643a62ab75---pukivekedar.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0772ae1f---48147694216.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f4ca0f6dd2278035f70cb642c3511870/95933496405.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/gubenetepe.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/494296222.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/77452801150.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c22c720c---lujepanitexobes.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/nofomel.pdfIn PDF document text
    • http://temple.mo/userfiles/file/jagaje.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9fc6e1abd---liminonoda.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e270254f8a---mulavuvokuvigitokosozafej.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0887bdd7802eb37d02516f73fab37e07/gukizamon.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9rt54l97rp9q6r215rjeg1ep3b/vowejoduxuweluzoguvebaxo.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/taxeputubopobezojal.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/68843186161.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/3281719640.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pugurifumezos.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/27687680315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+siri+on+iphone+6PDF 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_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 10732 bytes
SHA-256: 8ad8777fa83f215e307762ad44dd338e64e2e7edcbe4f81a5b36c5ac86b83afe
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 17520 bytes
SHA-256: f09aaa3e6fddfb4ea22055e9028f815d82acb3f1fbadae34be3e995a30980559

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