Malicious PDF — malware analysis report

Static analysis result for SHA-256 2601dc16052c87f9…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 21:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c24751e51df4510b35415f9e37582975 SHA-1: 36eba406aae2b56eb4402e912c352554c6e54d30 SHA-256: 2601dc16052c87f942321afe7c45e8d3f822c28b00b13639af872591eb03560b
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://agcslohian.com/userfiles/file/nejozizewega.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff80d0435f---virenezubus.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/72564707917.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d92ebea56---rowirekad.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/losopaxo.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/0b8adf585543b0d8a3152d2c70c84475/75033805149.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0008164up98vahfilijv5aciof/69494360922.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/fizosomejewiroxiso.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/24080117761.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/xupobalixobesam.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160908de5e7f93---tewebimijunuguseseg.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18e8c99e9---sikipewipuriwamazokefe.pdfPDF link annotation
    • https://aedwea.com/upload/foto/fulakaj.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610247cbd55d3---83497004612.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/sapidamaremi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oemp97aotgmt6udq057kki5vi2/jekoxupukatijov.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/22f58428ef03ebc42ea298a629ce70fb/muributovobejolarufix.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///70931621152.pdfIn PDF document text
    • https://dm288.rs/slicice/file/poxutinozawapotolom.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e30a836e1---32475900738.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/47169310496.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/rozanuxilovodo.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/16231912740.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/45699486398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=skewness+of+data+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_off0000b97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97D 15824 bytes
SHA-256: f9b622dc49f83e9afa2d30adc905f2aac91c9fa0412d4e41c42cce8435cab6f3
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 10508 bytes
SHA-256: 154f0d880bd3e23db1c97659514fe6420311d065e081a6cf7d82569d17bcf42b
font_02_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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