Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28b32200434d66…

MALICIOUS

PDF

86.6 KB Created: 2021-08-01 09:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a84747c1546775fe55c41586704066c9 SHA-1: 940a5aba6dac5a69c0f4818907024c35472cd782 SHA-256: ef28b32200434d6609f2b06a93c0a2f66403d206445e02797cde33de3739981a
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery disguised as a legitimate document. No scripts were extracted, but the presence of multiple external links suggests the primary goal is to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://budohurtsa.pl/userfiles/file/41144892940.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/04a12ffc6956e603093f5302c591c49d/xovebujamo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc0dbd116e---silutejelafi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bh6f803qid1min8tcmetep6qhi/25289200838.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/91914645144.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/6848465756.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/wewixag.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073023b832fa---75171525079.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/jilamovelagusulijolebibag.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/87650429942.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/gawikalomukoj.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fadodijiratakewipomidudib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16d73bd28---53981440762.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/44b04d76ef05078ce912bd945d3c3feb/gojapikisozori.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/27879656472.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/3ees9lcuo3ktnueuvksamisbuj/tanamumolotonutazemu.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/85977920004.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/de1023cbe444b7cdc8794208a70c0dcb/28855111803.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e612186d3---tanukilobixigimiwifule.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66d906989---77385923725.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/64473801108.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c77c0e7a2---54240699652.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/t2gfpblgnrmo9r7m7s7chmo1m2/kipusabagejerunupekaba.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/komemofaj.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e928c8d8f6---15448249241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=employee+attendance+sheet+in+excel+free+download+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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 16592 bytes
SHA-256: f24405995f1918eea783b1620862fb958572e64bd7f8b8f8a0106ce15f12b59d
font_01_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 11168 bytes
SHA-256: 4373962c5c668545c5b90a761b28bba6c4e26c86264db5cbaed710c8f2159875
font_02_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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