Malicious PDF — malware analysis report

Static analysis result for SHA-256 0157c5aaf72c1d6f…

MALICIOUS

PDF

77.4 KB Created: 2021-06-16 04:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1fb123d74812143406a9b6d1bc5ff077 SHA-1: a91a7ef33c2b9ade3c48fdca864ca7063699fe79 SHA-256: 0157c5aaf72c1d6f0af8cc8af207b2b0c239d4e067386e6e1996a71804f15700
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The heuristics indicate a link farm designed to redirect users to malicious content, disguised as a 'management dictionary free download'. The embedded JavaScript likely facilitates the execution of further malicious actions or downloads, contributing to the overall phishing and exploitation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://wastran.ru/uplcv?utm_term=management+dictionary+free+download+pdf PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7faa7c370---ruzikitomubukagezodotu.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/15463969105.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gomesex.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ic83kk5pj4fh4ah9mnl0hc4dqb/weladugavorawekurozejox.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160badaf92ae68---fufegiguluwakexesamek.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8079bcf6e3d91c575c37f2a474564e7c/4160788203.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mozun.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7de978d2390460528dedc6f68397f468/69431384375.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/xixofimulewuridosazewe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcce845b7---2256019773.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nozawadeb.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rufeka.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c900cc07d27---zefubesep.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b0824a20fefb108c925c9dac71dd6f8/duparogovikaguvavag.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b4e34e164741be923bfa6672435274cb/46600733418.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7bfb3ac980778bc5907800fd0aae2b53/bosegotepebukutosinike.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/96549213011.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3kkncf79vghrhs1pvv33h4jnkr/penikofire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5496 bytes
SHA-256: ce3dbaaad41d14b216a1b14065de3c73e6a55381b0b6e9d578b8805bdb6ccc8f
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10896 bytes
SHA-256: 894a1ed8cddf3008004eb45daa01fa952bcc00699e74f66f2dd4dbb264de67de

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