Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd2ff1fd0762a64…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 19:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30a8b15417285fa780caa052192cf4aa SHA-1: c60fe48f798eeba2e2ca61f15c41d7c0f15e45f2 SHA-256: bbd2ff1fd0762a64af51fda8f88799b083d917e339e47c6be554e22f905d4a29
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=music+learning+theory+pdf PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132279570435---97599794152.pdfIn PDF document text
    • http://weldingplaza.com/files/file/velubobetomatun.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/15249179957.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/samofekuzikusezif.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/wukoxe.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/ramaxibelofaf.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/sozosafurenot.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/50594656917.pdfIn PDF document text
    • https://bfull.ru/uploads/files/musorixep.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141e8ee8d9ae---52311227686.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/vitipur.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/zovebilirufomuxem.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/jufinuta.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f77154a7---52501425999.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/jevalulipitujozox.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fexegakasogogisuzoxo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/majapuwojitaxirupabusa.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/89472340382.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/98273998343.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210912_3FF4A1E101545F69.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/xopomineviburelowi.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/feteputuwakoj.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/75615244075.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/13585388883.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_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 11108 bytes
SHA-256: b8a0c40b6e2ab26edf196a0bdd0476ac632607c09cee03095f67016efde496b1
font_02_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 17140 bytes
SHA-256: e474d621ca87ed1e788885cd35d5c7ac9950541ff8982341b18cc6c61f1a7d01

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