Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab540d792b463ffa…

MALICIOUS

PDF

93.2 KB Created: 2021-09-04 07:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0828c5a364abab97d6e7762e5e3060b SHA-1: e7dca0a6d4d9b4e07bc41ed09aa59ade42852f5b SHA-256: ab540d792b463ffac9aa223030c1927a8f59830b3c06efc0378c72db183f2aee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lc5lksovukt9d6ncmeq78diu70/nufekazojalowajajeba.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/af7beo4c7vh7vqibgujd3okhro/ropufefevavonivajegixok.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eeedd54b6---60091769744.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/tigorupenimag.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/38732416097.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612e56667d948---31790061294.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/juniv.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e3f613f73614b172923ea315ebb8f6ac/77443154557.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/zuvoxanararomadivowusugar.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/xalozukokowafiwum.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b8775705ebdd49bfd78e84f50142bffa/33238343831.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jj8h9to8pb6vmqepdic8ap7296/soxago.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b635f15b9---semebabuxomexetig.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/4674116462.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/waxawezuvivekudogadotaj.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/99832e09deba401415dd69829a5b017f/bosidijukomovututilolerox.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wowebegi.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xigusiworenibudonaluxaziz.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b519e66dd---jilokuxudupexatobob.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xejevepoxuz.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e4788637cb38fc7a11a39fe4d18ff0f0/kaxugomovigufasegetagi.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/40168140390.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/44394747845.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/832868deb9d74f2c45ce01df5de9a2e2/6911835877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=freezer+electrolux+horizontal+manualPDF 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_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 19056 bytes
SHA-256: e5a409067137bd3ac09737c206e5c3381b9f77c5b9f9086594753a52f6620b0d
font_01_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 10564 bytes
SHA-256: 3f8b2e0960d65931a626cc4bc0e1472829b78c027180f561703682563cd4af50
font_02_sfnt_off00014ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1