Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f60d62a0350e83…

MALICIOUS

PDF

84.9 KB Created: 2021-07-17 19:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bb835628ea26021cd93fdb5c56e136a SHA-1: b51a352d7737028b21c2837840b74b3e2d6a1fbe SHA-256: 58f60d62a0350e833d99313d2a910696a89acac00c5d8ca467adf683e0a24522
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple compromised hosts and disposable domains reinforces this assessment.

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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/02f58bsd3en4p10dvd28q3fl3t/pelipurudegofikefedogu.pdf In PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/87799132554.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/56239494498.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ee0ef986---bujunujodatobiw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o97n7he1j4tnstk66081adaog2/kaketupoxiton.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/2180279191.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/o6g0spk8cemi3e3dm5tq0act9k/53257693891.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077523b841e0---jirebefitavipawutitogaxir.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ed327101d3924409f772e3e533d8280f/74347148601.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/83199226672.pdfIn PDF document text
    • https://menu2uplus.com/images/file/64671651991.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0cd755d8760e496fd675ecd5a3434af4/83964363289.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/remalibixog.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69704331814.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/32778881787.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeaaa0dbb---pikunuvamibiwuwunuwa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f09326f8c37799cca93f2c4dab78d40a/bugusafuguxe.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/46267358464.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/53949407785.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/aef2ffdb4f71f8f4ce244175d565a297/rofugarapaliwi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469732e6d3---47666900538.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/samugasitipesaxo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160820f6848470---wajodubikatevel.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/22056611027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=apa+6th+edition+and+7th+editionPDF 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 10376 bytes
SHA-256: d2cce1607aab8a6a29f2a1e23eed37467531b20cfde8f1ee137a940638bc138a
font_01_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 17396 bytes
SHA-256: 1405074d0f63059ae6ca3c88c3823b4bc47fc9ed12ae50fde9143c0e02348a31
font_02_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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