Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91128683edcf39a…

MALICIOUS

PDF

91.7 KB Created: 2021-06-30 00:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4be07eefd9e3a7ebdcd73d4af2e21f36 SHA-1: 863e7dcbf64899e5ff47762d41e059781f91024c SHA-256: f91128683edcf39a2d8aa8e42d69e484fedbd139a127d9c9d79a92ef22b983fa
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of an IP address literal in a URI further supports the suspicious nature of these links, likely leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • 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 http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c3c7dac9---8632139450.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/vv8de442d3oc402t87qjsh1uuc/51354498001.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/26792794666.pdfPDF link annotation
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77e48b3e1---nujorerovijuwara.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ss60ook9p39649gqhin3jbtbb0/85653090400.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/91722716701.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741acc73131---lasezokodowenigazifovalum.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/11181809538.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774eb61ebe2---25332589651.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4096bd505e---fijepu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa55b71237---41182257863.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef161bea9---lajepawugi.pdfIn PDF document text
    • https://vestol.bg/files/file/45397752744.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/svskc5s5lvfnma8c4dbjr8icm6/sajejiwisavafimuxawon.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/mefidazekavejavewagesimo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a007fa03d78---rifazudubet.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609907fa5e3a6---jesezekakakuge.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/patev.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d841408f---tumexebenube.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ceec0c73---46559372593.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vosixonalumit.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2qkt32a82vitefbscbg0fakl0/62923991091.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6607a83a9---zazapatajok.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/32767852349.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zajovopiranosodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=react+native+form+submit+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 11096 bytes
SHA-256: 7a40f7530d45cfa4bd747fd6ac5e1669c0e78327dcd7bf265f4bd5d865cd1717
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 17236 bytes
SHA-256: 113e2025ef2b0b63660a3cbbd8739ae35120406afe48b57869a62e50cf11f674
font_02_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14998 16936 bytes
SHA-256: d148cc579b61088b206b65a0b6c56f04b4b3fd8c598c2b9f7b0abb0028631757

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