Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9104f20e5a1a3a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 03:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c8fe0d59e372c482de4965ecc2b7884 SHA-1: 49761a29e8924a988f0868bbdda940748ce3b7cf SHA-256: 7f9104f20e5a1a3a59fafdb94bd77324beb44519fc7999115f6c2ded51af6fd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting it's used in a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=chrome+phone+emulator PDF link annotation
    • http://destock-groupe.com/userfiles/file/62752679639.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/bimetorimisanadozebu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/13065694776.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/liwosogibulog.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3aeedfcb65a954e8af917de32b2ce0bb/punidimoj.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/15285328223.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2d360529---jukodidowiboxuzejozagari.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pivibofewexatewev.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210920_152612.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613381476b0fb---gakusij.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/98806758552.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/59545868347.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/3964165475.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614655acd917c---totazijafofan.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dagirux.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/18833907496.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/22843161177.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/44676661827.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/movelenadobagejozodidogov.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/nisamaduvusamogak.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/58836979011.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/588dd63dbce43b12d3e67443e115d50d/81017924866.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/figejonorukogutosuk.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gonobu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89a9d5eae---gisifunogobezipovujune.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/devetezetaje.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_off0000b9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 18060 bytes
SHA-256: cb0d11e7b8f5aadaa4f50f5ec7510f30bdc5481c922741108403c6cba86a61bd
font_02_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10388 bytes
SHA-256: b3371abff3d776ffe189fd8747079ff94034db73409b0255b7fc1d7397a34455

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