Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf020a6d7c548bb3…

MALICIOUS

PDF

78.2 KB Created: 2021-10-04 14:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ae62326536d6c5aba93b93bd73791fb SHA-1: 70a52fda850847c70246cd38bcbeb2c218aa1a65 SHA-256: bf020a6d7c548bb3a871d234c0a1154ef4c936a5794010d2a0a41c15f49c99ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially for SEO poisoning or to spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=zycus+aptitude+test+questions+answers PDF link annotation
    • https://kolbandibileklik.com/resimler/files/tevipijomiremew.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/20490860087.pdfIn PDF document text
    • http://sbairs.com/datas/files/rukovuxevibugejazen.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/87483033375.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/20889994819.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/nupisitufisiwefokenisuvu.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/dorazokix.pdfIn PDF document text
    • https://mediaskills.rs/files/mevujezefof.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/27688593811.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/82414804943.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/54899555614.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/53500940924.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///108291181.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/modivugetixelut.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/lifevumopojapujidemo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/82ji714sq93fv7p4g8bu1omekc/77560693862.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nerupajetobeweniz.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/virizolifolomalo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151277934476---foxes.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152eb7e238cb---35781562470.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159ee83d1607---90778550374.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/67700956788.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/34777450653.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/8860130196.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_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10872 bytes
SHA-256: 66a21e83ba32be492dc90f57f739e66414bf7eeddb35a3272b12e6331fa570bd
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 18648 bytes
SHA-256: 69243add6a0f3c8813af97fac2d8390eaddef6ea1a4f043af477f0fe060b49a8

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