Malicious PDF — malware analysis report

Static analysis result for SHA-256 738a6831089b1510…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 20:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5dab28a4ef48b768fc60639f1c3cf0a2 SHA-1: 22a9f0f76b985eb1500a3f94658048f7425d083e SHA-256: 738a6831089b15104540149ab68951bde3d8acc2667e508f492d86441ac9d09b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://coretry.ru/uplcv?utm_term=give+example+of+decomposers PDF link annotation
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/bamawomedigosexazojanej.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/likujes.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/14268726502.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/81853451096.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebc37caa7---84662798303.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gogokirimurenaperazudi.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/ferebitawudokusaxixoduto.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/95613442295.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/43414750075.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/fexokegovotapezaxawoler.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/suvigopewapoketazazataf.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/jubabezakatunokifafuledoz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23ceea5718---gakevugifegadomegotov.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/86634808780.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5bibdggbk57qenu9um6td41r4/bureladumadot.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/82194658415.pdfIn PDF document text
    • http://ezibra.pl/upload//file/nepaxufujoviwijowekavol.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/vuxogadituzasixos.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/kukivefororukavi.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/97429730419.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/moxikibakamumiriv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149afd39ae9---49601445205.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9rb2vk1v8udq1q4eb471llkpcf/jijirep.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_off0000c5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C3 17092 bytes
SHA-256: afa060dd76fee5a5f69b0b13cdf2551442c7d3121f31c10d86405f639aa26add
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 10784 bytes
SHA-256: 88df3463172c21a02276e5cc449e39180a3558b48e894c54ca65556773f4e9cc
font_02_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1