Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a6449f6f6f6a10…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 18:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5a5c99ed5047ea56eae0ddf9ad65bd0 SHA-1: 373d2f9ac3d6fc8d451e4e263bb00ab39fd0db59 SHA-256: 98a6449f6f6f6a10919eecfdce9307654d08cb8a9fe0186b70f77200754a65d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on compromised or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, but the presence of numerous external links suggests a redirection mechanism is in place.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=display+phone+on+pc+via+usb PDF link annotation
    • http://4chan.ro/UserFiles/file/57056636998.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/75575890236.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/93277066952.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/sawaline.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8b6092a3e46c173c373b160dc0403e65/kejebopagifupisodomigejon.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/42110247262.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/wikexodejedutuxaravis.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144244e0ef6d---3658019519.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/mizirutupepapu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a529bf1276---72201949460.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/33259332735.pdfIn PDF document text
    • http://myphamasia.net/upload/files/71564549817.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/54430872027.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161300e9949edc---wuvikuxuvoridumolusugi.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sojujotatowudizulirolak.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/71810816291.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346aa5e5109---23207055383.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404674975c6---62061607412.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/82912451462.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/nojatozep.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zilenupelaniratatonifam.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/3973405453.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/duxefosonemitaboxex.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/50804349519.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/25066763995.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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10692 bytes
SHA-256: 0775f36b43c80c2c84ff3f1c4bd210634820434d530255e80269955a591a33fa
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 17396 bytes
SHA-256: 114a620dbe120b77e0eb58849a26fe45878a6adb1a06443d43e799a9f4237e70

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