Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b5bf4e0a338231…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 11:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 526c0656ea76f35b3a24fcabf57b15b6 SHA-1: 3fb679548d62f0261bd5847f36c65f2b6d036a12 SHA-256: e2b5bf4e0a3382317210c609fc6f73e26b9b7d66df2f3830f5cc1f8232017ea8
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://asbufestival.com/uploads/FCK_files/file/57134563568.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library//File/39819225427.pdfIn PDF document text
    • https://izr.fr/files/57477968269.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/57935256559.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195d8bbeb8---75726185013.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/panasozukigemuwov.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/9388028329.pdfIn PDF document text
    • https://aashianarealty.com/file/tedefo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0985bc3ff---bukerudokamoxopejojafegal.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f79c0f8f---97593437367.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b629e62a07b---24861405356.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0730642a1---58175045002.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/81c618f3adc2b67c59b060c788063b3b/36154242541.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/33201087450.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/12855668941.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/50840045553.pdfIn PDF document text
    • http://martonelektro.hu/files/file/97833416147.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c58ea8b10---896957735.pdfIn PDF document text
    • https://sbufficio.it/file/gixuwatuvisufawutizedev.pdfIn PDF document text
    • http://myslizdrave.com/soubory/6056058964.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/wumutufodawegobimobid.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/webotarosef.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1924cc56---4259390383.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/12285268943.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/eeaf6f0184138e9aa2d0bbaab535e8b9/99461322856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=data+and+computer+communications+9th+editionPDF 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_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 17812 bytes
SHA-256: 607ac28f956950ba669fd46aa9914dab8db0faace217c79146b496a654151e13
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 11004 bytes
SHA-256: ecf1c425d1551dd2d54e456cc3f9562651baab5783b060eeb9e80dbc5feca2b2

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