Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a31070a6b62fa3…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 11:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0c04672186d234075bdf3cd66663f14 SHA-1: 669b416808758a2c29356c17ca381d7d4f16d41c SHA-256: 58a31070a6b62fa325da23f8c3bd8507f9d07384786135313cf9eec6d66476ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://garglob.ru/uplcv?utm_term=germany+land+area PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a98310e6---69503777872.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/vonowudorivewadinupudej.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91899808695.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/808a910ef7b1e910a5a89f36c53091c8/kerakifoxafevulo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48e014ff0---xozemol.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hrph5d5drrnh6i2plvk6bmaqr7/47214438777.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/bekonepijut.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/bewowadamijonet.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/gogakasewirokavu.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e9c92846c0ea3a11d51bdf7af98724b6/78830633206.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d3430beb7dd863a7536258c5d4309d20/13330122173.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/jabogopimanapotojogaji.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/48358895229.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/98656377571.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/21869884515.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/19137329099.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8kpoa2jous8p7o9598uo0un0q2/nodolifepusef.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca0da0bf61---67111437257.pdfIn PDF document text
    • https://windsbs.biz/files/file/83286641989.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/fixotuxeba.pdfIn PDF document text
    • https://peterdegendt.be/file/53831131626.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/dudemiresof.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/59063771374.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/jirako.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_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 15864 bytes
SHA-256: 86a2610d2b753ba7b24a213c1b9178214005b800c78936253982bd387ea3660f
font_02_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 10084 bytes
SHA-256: d3207a1d1642736aa3e3e1d4e1a953d8b2a3653c14c7ef872f832a562572e29d