Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f9415b4aebd155…

MALICIOUS

PDF

73.9 KB Created: 2021-10-02 19:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8f91a436c0d27bcacd7f0294f93d1bb2 SHA-1: cb496d17c83a097c98df0c32840c1b541605963f SHA-256: 11f9415b4aebd15579d4489205c58e7edde30c5b58dd43dd0c61aca61fbb9d42
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://inwebjor.ru/uplcv?utm_term=self+quarantine+after+travel+between+states PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/69891537525.pdfIn PDF document text
    • https://people11people.gr/uploads/File/10050331373.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/78706311250.pdfIn PDF document text
    • http://www.moyekolodin.com/files/49668432714.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613582b0e5c10---jogevakub.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d1dd56fc9---dibiramujalejufe.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/sutegiwimiziwopodakesuw.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/ferubidowepekubumipi.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tokuwedepileb.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/gabikejojalapizepixaf.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/nojulekunefapef.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff8c5a34f6---78176400998.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/mipuke.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/52851029210.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/disakomimux.pdfPDF link annotation
    • http://teranor.com/ckfinder/userfiles/files/vomewokudar.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/kaxemigesub.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/famusebutezuri.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/nisexojixiteguduligutepuw.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xelewolulezidozebo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d3d3b1c8b2c4acbae7cea17ea0112b13/96324281720.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/23943369845.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/sekewuxepopuvozeno.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7e91cf5---40109802474.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/jazotajekajorefer.pdfIn 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://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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 10700 bytes
SHA-256: b296d7b517641b4ea96f385e5b374e38bc8b6afcb100edc1f2640dc14b458a28
font_01_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 18760 bytes
SHA-256: 0e259836245b0c9da4d02250ce93564aa6d18a45656318aca510f02f83b6f0c0
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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