Malicious PDF — malware analysis report

Static analysis result for SHA-256 b320c2b3eb0bca12…

MALICIOUS

PDF

82.8 KB Created: 2021-08-21 20:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 512ac432be5048e8c501aad5b02f025f SHA-1: 57a6da4d728dee81ecf5c9fcadf07cd5ff550331 SHA-256: b320c2b3eb0bca12b50f5f66c1163c342cb4bc86629b21265b63fd27a5459416
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Several heuristics indicate the PDF acts as a link farm, pointing to compromised websites and potentially disposable hosting, which are common tactics for distributing malware or phishing lures. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c34650bbf1f---xipebaperixawugajosuk.pdf In PDF document text
    • http://daisin1977.com/js/upload/files/fusozewebo.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/besuvorudegadewenok.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/mexosonuxusebowod.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/87695426514.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2d684ca8d2e872aff9947231de57e53a/xixefeli.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rfb1ummf87re5no97oimpt36rs/42000160789.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/puwepafev.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a77a4a09a8ec4f3cd4ce83092e7cb78/gutezaresis.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/1682978691.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b044cd61---nezinuzopi.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xuzavumobiv.pdfIn PDF document text
    • https://securitydm.com/slicice/file/sedaletewelupun.pdfIn PDF document text
    • http://orderkai.com/uploads/files/95302715096.pdfIn PDF document text
    • https://jjpremiers.com/files/82531583487.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/73082960755.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/90860303284.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/486d21d18f291b7a111f564318ce9973/monuzojuxisomajedalogi.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/mijinijod.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hcvg92097hreo91n2llhooohva/gopepovisujezuzigozuk.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dutosugexifegud.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p7s0ek8bvqb95jgl2u9esn2uc0/7731669579.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xetaxafawegulopujo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/978dfc3a1327b164fffbab746e6fd1f3/57739337875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=percy+jackson+and+the+lightning+thief+movie+actress+namePDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 11328 bytes
SHA-256: eacc02fc534c77ce54fbb51f87f7d7f91d6c208356a838c1c92d258810428d92
font_02_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 16744 bytes
SHA-256: f1f096063e6a1ca7508d96f220488b74edd89ce59d13a7ee6202921ff807ee43