Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c28f6696b89d45f…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73196b468244fcb4ef6c8c706a3bcbb7 SHA-1: 657b337e7b1e12e6939ab53bffee1e4334843840 SHA-256: 3c28f6696b89d45f0063ea404dc55f94ea32a3caa940b572e5a28bea2c2d0f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=feline+leukemia+merck+manual PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16117a4627fabd---5809993098.pdfIn PDF document text
    • https://plasy.com/uploads/file/pekovadi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vagefumudobip.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/70534da0978a089006685455f902d958/fafomuvenawulejakat.pdfIn PDF document text
    • http://wych123.com/upload/files/5469079170.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/54414366189.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/99785491341.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kibanu.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210605000708.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1554ebe3---fogiwofiraxuzixo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/73196962394.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/90574463001.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160753b555d901---34144818862.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210829051111_dikgv3.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/37765676501.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/40393486142.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qdrncpfiej68pt4mhc83mto7p0/68019460135.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/31330958164.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4e74306a5881d5e95341193f5a989ccd/79925458569.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/vufesewane.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f4c5338f48979e2ee8ad45012568ddd7/metosuwupo.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/87234897645.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/18912471584.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rabako.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/123078586.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_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 18680 bytes
SHA-256: 099895e88870cc84922dd3dcec713c7c35d6e92d41f1e93f8ce32fc3b03710c2
font_02_sfnt_off00015b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3F 10172 bytes
SHA-256: ec96f9009f969b687c1755410fc680113e658048d2d086543dfab32b1003b296

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