Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e2b0d0859f9946…

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 17:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b866188ba8954d4b729c52cb5e03e02 SHA-1: e44263d517d58866af7e9227e758184b8a3970f8 SHA-256: a2e2b0d0859f9946c53a50b7ebf449ae7073d90ce94a763ed5b105995ec87ad3
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a malicious intent to redirect users to external, untrusted resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/24c0057b6054b66b9b18257ec9bff435/koladabeligiwok.pdf In PDF document text
    • https://najlepsze-w-polsce.pl/uploads/24237443495.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/labupowodedogaka.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/gokiwitosasuzegano.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/25402863748.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37900d4a2b2139a038d7227027de093a/81478611711.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/92391650469.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8ac8360f45a7a31c1fd725ea37005752/75231341668.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fiviwozoki.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8mvk35fnmuk1nplujgbrs6cij5/fatulunasefag.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608177d225e30---ruvumalewefupapumoxoseza.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/tenawomewusuno.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e49997e4---91826364455.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/gujubavezivitige.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/towibivakizasapo.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/73225746245.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/xaguvepimoxam.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/30518194559.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a8a7b792---kogiserifabovipikizawif.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/1107830073.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8fc062c---34512674402.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/vimaxige.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d07ca163edd---90732457104.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/74645403795.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/dolowovegowuwev.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/33288911448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=oiling+out+crystallizationPDF 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_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 17344 bytes
SHA-256: 8612085c596e2dc4c7848baf205d0f6596f85d54e0fde47bd0dd4f54b2e27a7e
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 10572 bytes
SHA-256: cd4b09e57a2af4f9a70ceafa3124c259804b675926b1dc27e42211db90b70243

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