Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed49cf273291a294…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 19:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af40617cdc60ef54afa6634fed728107 SHA-1: 6856c178f9a356f8ebf545276868ae3c38a71cdb SHA-256: ed49cf273291a294587fbe5d0521bc72288d6b67c85b17d2bc312e8c43fe4331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18be23365---63569425590.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dee292cf2e5c38dcdb17139e98a83056/jivokajitibimutoteb.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f62620aa---fivopojemekofumesoloza.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/finivupevaxe.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c189e2368ee68ce5dfe929291f237a39/bavupewubebiwumarubuz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33f035ada2---wupowekisesarejixul.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/pozasa.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/dedija.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/nujudalexav.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/19401905311.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/63394265546.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/78991774920.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3433897096.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7066uhggsd1dm1c1b48rpv4g5q/29388717342.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/puziti.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rpngnnth1j7rp30s9rjkcos014/78142043489.pdfIn PDF document text
    • http://keitbg.com/images/files/funelomoxobagodutobub.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/vapifiruj.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a45caff0d---81541592846.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33952639468.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/47448602693.pdfIn PDF document text
    • http://goref.ru/files/file/81905610928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=programa+para+poder+escribir+en+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_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 19928 bytes
SHA-256: a5befc11cc28bca8ebdd54bf5ffd8dc4365a094119e353ab5b9095513a30d27d
font_01_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 10960 bytes
SHA-256: 075c82fd4e05c4871bf4b333b54c96070104f8011ffffd6baed135681d90c8bc

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