Malicious PDF — malware analysis report

Static analysis result for SHA-256 da62cdadf11d68dd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 19:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47c48efad922804dfd78d22400bed217 SHA-1: 31bf5959cc633b1dea4e46679c525e20388f3530 SHA-256: da62cdadf11d68dd10bfdf3d8362db677ece7003ac528c1c1d2300b52a25bd5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=guitar+major+scales+tabs PDF link annotation
    • http://kiddeefire.com/media/userfiles/files/gejuwidivavedededenev.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/353844378.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/9788757820.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161388163bd2fb---47075750924.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/xupadog.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o7qmkdvosctehq18t5a1h1321m/73087136469.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/vesikulepugewoge.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ph6ah16cd6rm29ngvnse1n4sl2/69213198582.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/76657481543.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/62477829053.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/25256679959.pdfIn PDF document text
    • https://betsin.org/userfiles/files/54754399172.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5d4ab772---tidez.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/taluroxawavozazunag.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/jifowekixiliza.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/10330950434.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a921d3185c---rilim.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/bexajagur.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/moxuma.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/pakowigidaxofate.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/sitesisesimafegija.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/34755427470.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/zatorirorog.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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 10696 bytes
SHA-256: f457d44ef6b988ba0aad817d7bcb3f7158ee114f8387c3cfdcd0e7fdad503117
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 17552 bytes
SHA-256: 8b8e80b2daea5fc2830fe5308e0cad58a962961c4a1e7d91ef89407380da8a08

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