Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b1f52e0f2c89e3…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 02:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 65025a54744d086e7cd3d280939ce456 SHA-1: fb9d875f77ff9048daa50cbaa9a52f414a67f93f SHA-256: 80b1f52e0f2c89e367d8eda39c54722112ccb9ff5b4f463f89f22477f1d39c2f
196 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a ClickFix social engineering attack. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content. The document body is heavily obfuscated, but the presence of PDF_URI and SE_CLICKFIX heuristics indicates an attempt to lure the user into executing commands or visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.biotanika.pl/upload/file/bitenanemigavepuxusofuj.pdf In PDF document text
    • http://www.urbanwaterways.info/files/beberileki.pdfIn PDF document text
    • https://serka.com/serka/upload/files/9849332257.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160908124cbb36---nofavowulatobefevadelo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c712b7fe---56952340067.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609072fd86d7d---60859447015.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160917ab281057---bomubi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/q4nulebm10qg34jkvfn8cqspnt/wasijizugonumopuzi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96c91370a6---29706257148.pdfIn PDF document text
    • https://ka-base.no/images_content/file/45150487153.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/ponepodoxamesuzozazonufi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe025d0ae---rafekabol.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/ranopitopesajejivok.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c8dc8617---74860401101.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096c4e948a67---fonotimeje.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d36dc7ecb---24572340905.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877cad2638a---47238669796.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/bad375363bdc396a2fac0d3641c58aef/82371390839.pdfIn PDF document text
    • https://ivanamihic.com//files/kuveset.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e449765b8---24855988240.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077da791ef3b---3659612096.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/39e4dbdb005dbd5296da46129f1ce741/kodepifawogom.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/45473517654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+split+pdf+in+twoPDF 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_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 17056 bytes
SHA-256: 971ab5072f86df54f59332559a7a2441735380bbc6ae7f087a8b64cd1fa6b366
font_02_sfnt_off000139e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 10172 bytes
SHA-256: b5e5a4bd7d64c938d056776b8e47550e204dcb984f86c6ed3bd90152d2f9deb8

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