Malicious PDF — malware analysis report

Static analysis result for SHA-256 939e5e8e958712a1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 10:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2eb69a0f8248d0fe1e9aa646d77a31eb SHA-1: b278642e715d043f8775a11e6e0b8ea025af9f59 SHA-256: 939e5e8e958712a18e815351b69e6a05993d6de5a1f02a6c842270ecc4b7257d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The primary attack pattern involves directing users to external resources, likely for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=tablas+de+contingencia+ejemplos+pdf PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9mbaqdo0oveka88q8ncd6k06eh/77056651183.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c637f83f6a3---laxuveruladudatitebi.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekefufinus.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zoguguraxo.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/38528989628.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/70848356236.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc878aa00---baromodo.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/vinunigovu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d03045a2d---nunizesa.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/tilalepezi.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/70712913645.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/89635075368.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/golozefemujafinotifij.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dee10a4a8---96812866702.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845eaae063---lofifovafuwekafi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608338be3821a---noleguvitametofexexoxu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a51dece6a---35511766051.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/fegajukom.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/21675009901.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vugikaro.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sojugap.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/zezinexi.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/serumofefojazonotefifawu.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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 18984 bytes
SHA-256: 32332705363af094829969f6d65fabbb05303dd7b96bc9009cb479fe6e8254f5
font_01_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 11096 bytes
SHA-256: 9cb78e1782bcdd30099964e3da1727c3c2e855d3d8d19cd04fd6e70649203846

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