Malicious PDF — malware analysis report

Static analysis result for SHA-256 85716f0833eda13f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 03:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70ba2bf8d99b9db6c4c9b7f942684571 SHA-1: 0e9d1f70a90893443711209760ff1d1de439dfc5 SHA-256: 85716f0833eda13fcc7e3cd1117c1a05652bd5368f3a252332235aadf2c097f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and link farm heuristics strongly suggests a deceptive purpose, aiming to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=discipline+in+secondary+schools+pdf PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c35693fbda5d0497cda3c5af644324d7/nuxowijupokijivu.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/valamole.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qemg5um02tp228k76otbb3vo52/kotekifeke.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/8146c67644268f43b6431428ec7f3515/23271033266.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbad1aecae2---besedekixoratiluz.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121ae4760abc---rebuxapowagiwunivijo.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/misoru.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2c1d12354---mepugoro.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/19743818337.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad8fa08b6---74251573237.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/23ed05814551b7c0e0c3f8a86f6566bc/84743522104.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/sixeriletixigagukifena.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210902_1E5390F48C53ECFE.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607caae3ea6bf---52890176421.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5acaaf383d---zimugakab.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/14132207013.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jigubetotusa.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/9019229807.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/20858193262.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/93194145689.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6uouitm2prqrp3brce2al4f7le/17077092123.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082fec49ccab---10140053229.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/622c24795ba2140954c26e9c692bea83/wofubulabemesukup.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796e1f1b4d5---rarajopexafuwijenuval.pdfIn PDF document text
    • 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_off0000b66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 10732 bytes
SHA-256: bdfc9ce9e5522ae797579740883bae296b8e8d86f454f88d9cdc9163c3a52e20
font_02_sfnt_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 16876 bytes
SHA-256: 8a2c07b2511cdf74c472bf81780c990421353ad318f0141218ceb34f31a53e3b

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