Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6f9fc763da504a…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 06:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf415dd1fc85fed43246639a3fdcf34d SHA-1: 14117c42daad6224f268412fc0339079ac49f786 SHA-256: 1a6f9fc763da504a03d2bb2c1ec971b2bdb6c361529058440369d1340a1c3ac6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/840306366eec75391d72cf49e44c3632/divajiguxozidetigif.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81971358a---didaretiraleb.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/dusunabonij.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zalexemejufixovakoxurap.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/lobisuvebenatikufor.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gefujajakipevipoke.pdfIn PDF document text
    • http://kudusde.org/resimler/files/zibajofawow.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/29112226794.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/31450072337.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2429c3807---26493654198.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/66896952300.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607421a10f935---dilitidadofuxupudenonom.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t2sfa7sesfoipvtua6cufc7340/zemubemawezatozojuxiditog.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0c758c42a---jewupinewisadojixobaje.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4668f6bb7d---56687690265.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/69712369992.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/ribetiwolutebuxuzit.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/43208061630.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b2ae5abefbc6ceebdee65f1c95995309/walivomi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/993b175293935372585774bf020fae61/29331899697.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082988cd684b---9589752270.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086961e178cd---zezapuladusolakavugalo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/sakavudozikupe.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a6bfa9236b30f2319656553e281c1e4b/kivosetojera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=le+t%C3%A9l%C3%A9phone+portable+avantages+et+inconv%C3%A9nients+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_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 11216 bytes
SHA-256: 8d61b3cee1bef6479db12e80ce63101f9340a9eae6a9e9a76d5f539629824c8e
font_01_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 18896 bytes
SHA-256: da15feb6a6bafd5537e0b5765ce8cbe36587ca5a9dbe47f6d854e5908ce923de

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