Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbc9eeba5b70454…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 22:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97ac1de8973f22a450ce76f3f6b32841 SHA-1: b2a78161815e020a4565b77bdffa88a81d05f736 SHA-256: 4fbc9eeba5b70454d1c9415e4b619746ce5f189982b51714585b63ffbaf0dd0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://deshdunya.com/blogimage/file/dobileresomuk.pdf In PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9f71474563244ffe0970e9dcd9828329/wepibu.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/jemeluwirepesewu.pdfIn PDF document text
    • http://www.toptehnik.si/images/74943843302.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/32904669476.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611436fa7c4b5---68126051663.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161289462c8141---91503715492.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e4315ed---99976770528.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/toruwelaj.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/47326082977.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ecbe5127---97285988988.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/rekakovejusufemokap.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uusntg9a88ole49m8pqqtvhega/zivinoseniwixipalezale.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tf3e9up6l5n1rc5iog914g03vc/mozodofagagagatu.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/98754544738.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gj9jmg9i94qcmjp0begafv2prp/talidelerawufogifagoxot.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/68204712878.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/31019826217.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/33238253668.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0ad3dd11571b210e1256cd88fc18c7b9/riwerajigejebevoxomosisip.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7f748266e57fc27dd36d7c925135e530/zaketoripajeb.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/judodo.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/3820468749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cara+convert+ms+word+ke+pdf+onlinePDF 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_off0000c32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32B 11056 bytes
SHA-256: 472f754e6b0f07f07cce7956621c37752f661ad220f50e549651cc8727bc27e3
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 17564 bytes
SHA-256: 626c27dee7df3f7d2065352db255670368348e9a6400858c687b4cc93d32d3eb

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