Malicious PDF — malware analysis report

Static analysis result for SHA-256 af84399aff390f62…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 21:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc3379b8f6bb544aeda50600c0a6682f SHA-1: 08850fe67b4737022cac7b26086a7a40e46b6846 SHA-256: af84399aff390f629bd8aa3474506adb1c4dbbc6c89207c4c11562c2f920b8f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage redirection or phishing scheme. The presence of numerous unknown URLs points to a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babb53be53b---2157260935.pdf In PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/68675514660.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6sk2eev41ilvlhi95r69eadhb5/fovunipinagigugosumixa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612a62aea7450---nejonotaveke.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/busuvakolojevuguwak.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b1b302b0deeea0cb484385672b283cb4/xejusijokukav.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/483eb45d01f3d699c4e1d3f7b1ac0ce7/83526984006.pdfIn PDF document text
    • http://armanetti.com/images/lanujikozajegozaz.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/99945316120.pdfIn PDF document text
    • http://agro-partner.com/Image/files/32233454932.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1626554331_0d8e9941a5.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/16720124014.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/muxigovujepagoge.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/48363535324.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608075b54658a---xuvagalituxivaxuzixasi.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/jometijilolujusomin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e0c77972---84108638188.pdfIn PDF document text
    • http://chieucoingason.vn/files/74073985180.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/jutonobizow.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/74002417981.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e4b15874---jaxixudob.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tmov171f92o6nlrvk7bon09ei3/lixim.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080321b4aea6---kimanejopu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/18359957318.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bidenuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=toshiba+refrigerator+japan+manualPDF 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://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_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 17844 bytes
SHA-256: 3416292dbc86886b5f2e6d9ba237b835772225a31e6edfbb710fa3f7ba1fcce6
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 11140 bytes
SHA-256: 7dcfbc4df31f46a5af522f2b5fc7a2a0125a1b5fbdeaadc70bfd902d4d81325d

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