Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea44e005b794904…

MALICIOUS

PDF

71.6 KB Created: 2021-09-12 08:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 734f14d18bb1664f443c0d9f71ecbca8 SHA-1: 3ed5671bcfcbda95b19dc566974ea69ad4decc85 SHA-256: dea44e005b794904947b0083d6e9de05d50d8eb3df2b701f73a85f3d51e91e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to file upload directories, strongly suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://espressobuilders.com/app/webroot/files/userfiles/files/rovozifitu.pdf In PDF document text
    • https://cmoretv.com/userfiles/sewoso.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zofopifewugalegugavezi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d31bececbf7d1cb3d2e64b7ae2b12aba/zugegugejazadabebonu.pdfIn PDF document text
    • https://parfumzone.ro/files/file/41297956088.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a551ca57c16461bbeb83563470d22ca2/59972324668.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/vimubezuluvibotimupodupiw.pdfIn PDF document text
    • http://esistore.be/userfiles/file/wuputuwevakalururatowix.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/71803100157.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kinizak.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/js98sr0ttj9u6e6ktk5on81ua2/noduvumi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdbabb115af05713d6b6df8e7ec68c35/10156535889.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/kupezipanuzigazu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/11340145342.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135b03b5030f---rosoxelorakaxosomizivugav.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/nawixizajuwamotubu.pdfIn PDF document text
    • http://dasbluemchen.com/raxitokewuresik.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/vupigegixim.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/werajomibumoden.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcfc33c22---juxanodol.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/makaxegimizuxopuximun.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lafuxiriboxodafovoditizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+increase+gb+ram+on+androidPDF 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_off0000b8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 15388 bytes
SHA-256: 30a0667361a898231cd069841db9314d3f998c84b6fadfadd1d817fc5b75f4a4
font_02_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 10884 bytes
SHA-256: 124eab4c68560ba5e7b391e1a88b4373be79c4c2d21ac252659784944ebefc73

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