Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8301ee77e767216…

MALICIOUS

PDF

87.4 KB Created: 2021-07-24 12:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8710f91096432983defdd5088e541a1e SHA-1: a42dc1f1ca3ac14c43dcc8db782ddaa7cad9943a SHA-256: e8301ee77e7672161d2b6df8e971e5e072dea88da54b234951207addca66103a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites. These links appear to form a link farm, a common tactic for SEO manipulation or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e455ad442---24052407925.pdf In PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/04a41dc5670eea606751a50e0643b851/17264145760.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6bd591fd---defakizezerutofagaxuwilot.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0461141001620074292.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh1u93jrlkn8bs922tm3lmo7r3/dutarotejafoziregox.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/tgohptou2ks8b1ob1guoruqt7t/79347667318.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zejutixalukulovod.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wamobemonana.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/26f4a1a95477a7da97ba4cc28d364b04/nuponab.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/leluzuvimavijefaranoju.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/39789541608.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jfu1njd1vpql23koe1175ku782/tufakazo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dd254d01---60486831071.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/rufoleguberifo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/qcrot1fa5n9rfj4h93aef8a9j7/69812487598.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cccd410f3---58420895948.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/jukonosebakemasefura.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f8e29e4eb89d83410bf726c5d5987b5e/85704989353.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/puvakozewibegudekuwiva.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/65034139190.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee36f6b5f5---xilume.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837c4b5f6f---54331497308.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745691f1070---49640401183.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210720_153233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=baahubali+2+tamil+movie+download+masstamilanPDF 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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 16916 bytes
SHA-256: d2b9a854c1ffd10677eb9289cf4f3900df59ebce8b98a8db479e8f904d9519be
font_01_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 10976 bytes
SHA-256: 9767f13a733b4675352e8aa7573f3264d82c1464c53fce475cb2c9d4112c3ef0