Malicious PDF — malware analysis report

Static analysis result for SHA-256 091d7d77f2c8ab4c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 18:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f5fd276b0988810f3191a2275b0ab9e SHA-1: 7ffe4833c678926d5582433ad43111bca31a8c65 SHA-256: 091d7d77f2c8ab4c6e5da8e101f0dc112134d5ff7c0b925538a170fbff4662cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lbk-ingatlan.hu/uploads/file/59544177389.pdf In PDF document text
    • https://thepainter.asia/upload/files/topivuvagejelu.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/6400155857.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160727f418d2ef---94897260925.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/66341181133.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/deponuluvifalibuwuwogop.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/90965831988.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737630c5b86---vonizojokewif.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39127a3bb---65064920252.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f9b8836075a624428a5ff56b6f357381/36164119116.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715e8747b38---1878505274.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b05a870c---46239808071.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/xazevudotobapiwazudukibo.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tarexowu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad031490e1b---60226391024.pdfIn PDF document text
    • https://digireg.pl/upload/21526992374.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/91391481289.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160806e689cecb---93973959872.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76826049627.pdfIn PDF document text
    • https://energooptima.hu/upload/File/74028309959.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/13511305502.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/jatugotujike.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/35737510553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=types+of+polarization+of+light+pdfPDF 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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 19196 bytes
SHA-256: a9ea4f5dab62c747e70361a1d8d3bd3c9ca10c316035c2bac7f17617c757573b
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 10912 bytes
SHA-256: 3baf5fa71ef48e2fbb08c57ee69ebd5cc507b4305e936c949d99c78e585f2025
font_02_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1