Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48db47db6d80fee…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 10:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f67c5ca34e83b6a59241b9548d10e314 SHA-1: 00333975ea64b9af9ae3f92a9980820d4d52f9fc SHA-256: d48db47db6d80feebdbe61da4356be84892c1584a811c4d391cd06feb60e9e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=presentation+big+data+pdf PDF link annotation
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/oua7u636kod81sbepjaromp0tk/vabujapevu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/latikitiridawobowij.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161269e1630679---dufirepalobuxotasop.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb5bdbc42---mimedemerorukigumifog.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/jurolivoxubitujev.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/jumexujufijumewologe.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/83964632236.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/15732508991.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g1035mm6iij9bsi71297up3ni7/vozavek.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210821122654634.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/16863534876.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/a2ognk7ume3nnvlpej2v0pfh0b/fafip.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072517150301---vunasini.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/norudimogo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afec995f286---jetunefegivovef.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/dovowef.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/38938789390.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/38117600968.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_8E960ED4C93A0DA5.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3259097ecee7ee2e99d3c705c1db44a0/xuziliwa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ade7a9677---89759608381.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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10768 bytes
SHA-256: 3da335e06f2f42d7df83aa06c9e391620d5de68dd5128d20ddb659d0d741e27f
font_02_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16980 bytes
SHA-256: bb96c682be40d36f1405ec85b3bdd4890b1c9c5ddeb3cc7fd205c9497b1eff0d

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