Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad3edb9699bbc14…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 17:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ade5fbca8b69b737d9cfd05dcf6cc6a8 SHA-1: d27cc4a014f03801d4b1c675c27faf74bdd24f75 SHA-256: 5ad3edb9699bbc140fcc585479a10ce73387a07abe46d84da67ac531f9f8af45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of luring users to potentially malicious sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pbg39dqkqfcfmenpbrrd04va18/97783423719.pdf In PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/wujanifilezen.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc69de4074---10808329623.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085c203e1312---guwaxidisax.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/47830145876.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/rebugufavanetevofaboxak.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/zikanemoxoj.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/48dba4ef2dd36a0029f7594c7f3c0d46/40627470073.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed790cc72---sinaniletebapafufe.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/rilosawuxasekejove.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ea259a621---siwijivarasanezowepojiw.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/12650276957.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85f7564f7a---14811505534.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/boduvusobopoluzasike.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/22015745382.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/300t00jqdd2ldhv1vqee2seeqd/73511544326.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ec3c83b0---23448928506.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/22608141646.pdfIn PDF document text
    • http://cloverdiamond.com/file/pegorexudasu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/546c7cc14d1e267b9cf8194a635b7e22/42039596089.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/xedosuwit.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/f46cee4e871b7b2e687bf70e1ebc11cc/larirowurib.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/d3qoebgjplbngsl0m1mh8anc1p/farosadomiwitalaroni.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4ee0b841ae5b243bed577828c42675b4/berukekedubeluzizakigovup.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eeec3ab66---44759207459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sampah+organik+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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 10668 bytes
SHA-256: e3566cfb69a54cc07a1bced89bff01df89cda0255a71782c22cc95ca1a8dc458
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 17508 bytes
SHA-256: f6d1ee83f08c7886fb8540398061f2e880ed9fbe0bb1d35339976fb9d1977ddd
font_02_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1