Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e23a631c3f4b89…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 15:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 387748dd067e65ffc90c23e1f979075d SHA-1: 3f4a19823cfbed6f053c14da45abb0bc01303269 SHA-256: b1e23a631c3f4b89c435d8033368b89ce8819126a6de40ab02a4835ec7497a85
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites or raw IP addresses, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=car+fix+tycoon+mod PDF link annotation
    • http://140.121.180.103/ckfinder/userfiles/files/62068256092.pdfPDF link annotation
    • https://atkarisuli.hu/userfiles/file/25583009891.pdfIn PDF document text
    • http://usateatop.com/_upload/files/31524500249.pdfIn PDF document text
    • http://ymmicro.com/files/files/sabelibasozurejusagujev.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1aa9aba87ee3b0571b5cfe4165323413/67561496076.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/61873114689.pdfIn PDF document text
    • http://wwsm-us.com/files/file/kajibufitodokipivotok.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109072343509332.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371df263b17---12615552646.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/72586449767.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/vovizidezoluvilifozili.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/82295214050.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/nitekizogutokurabaxotuf.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/87337964511.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/30712080530.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/35d56234378d7a04a930557fe6220fe5/tuzosipawalirupexexa.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jijoxadibifarivewefe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a423d0ffc4---71800635718.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/jinakekoxujolino.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/vinitunetufilibekogava.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/36423883103.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/rowiluwugizuxemikosenomub.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/81489549545.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133ad959f84b---96958508515.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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 17504 bytes
SHA-256: e900d2d958288a084168fe277a1c8aed577244f1f6a2370a7512a67844c0a1ce
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 10536 bytes
SHA-256: 4d5bf855cb50e72062d73682bd0468003ce60cba9cf18021b89bab8528101b99
font_02_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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