Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a4c4d905b5d6cf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 05:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f4148ef09952ac9e5a9fd2a5c86320b SHA-1: 8dea494c73bc4d4d9552b5969eb6782d14d499d5 SHA-256: b8a4c4d905b5d6cf0043813997f084124b46146d3398d1d108a8cbcc2b16c508
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a link farm pointing to various websites, some of which appear to be compromised. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://sgrappresentanze.eu/userfiles/files/63258668042.pdf In PDF document text
    • https://torgradio.ru/new/files/file/56706141981.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/72459984564.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/86223577686.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/10621252413.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/58016701303.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb6a9fcc2---rufomenawot.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/28734313388.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/xusigarunola.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/vomogup.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/wukaxiwovazefapere.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/6554488567.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/22694139978.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gt49e1bdtfl051eo8cujlqi8hu/nedezodamixewijevapib.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/76596931836.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tezob.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/77221205612.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cef1cfc560a3c3f2721bf8faeeeb44b/nidofuwuwiripolinuraje.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/96086037495.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/jorezitebagedojiw.pdfIn PDF document text
    • https://susta.vn/userfiles/file/39361617220.pdfIn PDF document text
    • http://kvrhousing.com/uploads/kukakegolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=como+ver+mensajes+borrados+de+iphonePDF 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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10880 bytes
SHA-256: b284f9c6270601ffe792c74a0ca8d0379dc05605692dc83d8d397249e3590e35
font_01_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 19028 bytes
SHA-256: 0d6595e91ed92c5c6598073edd1aee4dd5fd5e9e0c341de64f50e4e85c0ff9b0
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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