Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a70872494792dc0…

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 22:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1161f58fbffe9f474c05ffb60019d21 SHA-1: 48bb3ffa2192ddb24c081500129fed24d614d8fb SHA-256: 4a70872494792dc014248b0abfe60779bfbab6f46b861ed78995811a88cdcb1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The primary goal appears to be redirecting users through a network of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://betenagro.com/sites/default/files/file/23701812200.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/55864661275.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d14449d12---tiwasurokuzulibejujiti.pdfIn PDF document text
    • http://mextro.de/upload/files/44707897597.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/lenamubugivapupo.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/42467268777.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/rojevevijaxefas.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/joruvudalokavu.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dinorusin.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sakomubixo.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/74867257273.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/wuginemep.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608466e757872---xonapamuganulaf.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a1658350681c8b5360c936d39dcaae4e/negoz.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/gajonikobamoxawesob.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/627cb29fc10649a443627a3fad1dae8e/pepadipigufepane.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/buvovoviz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d94f72d943ac546a11b544d34ff3bd86/gepopaj.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kikiji.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/49688657917.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/titoximevudox.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094504f3431e---riguworipopilepawisivavo.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/8c06d50b789e1f4e8b21ae0c961220f9/lajejevirubipupenu.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210613_025243_3739.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ed8c3bec---88600589799.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/7060336786.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rufipasegasoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=auto+followers+instagram+apk+2019PDF 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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 11420 bytes
SHA-256: 048cf20315e85f5edb30b6d208a8c4c0274b3fea76a466163a3bc0ab97d4e94a
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 19300 bytes
SHA-256: 8b38832d520039f103b246b111f9c00b90eec3e8f9c601168e520d25a98b3965