Malicious PDF — malware analysis report

Static analysis result for SHA-256 110c9ac84a041613…

MALICIOUS

PDF

88.0 KB Created: 2021-07-25 13:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbf941ba86471d59a75b2b8d904c31b9 SHA-1: cbd7b73955fa42df4e3fb36c1189f1edfaa17105 SHA-256: 110c9ac84a041613f56206109ab546f91a8ca5f6cc2640c77eb0fc7c87eb1e75
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of multiple unknown URLs hosted on potentially compromised infrastructure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087df2691e5f---1985144458.pdf In PDF document text
    • http://mousike.it/img_ins/files/vorozojebojokirupavam.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4009c809f9f5e88ff4016803de1c2ad2/87306465514.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/04116a215c6fc16377bbc80f066d5832/26862642277.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c026105219---rarelerasi.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/98218025576.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-29-00-28-29-98.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/giresojifurezorip.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/wizofut.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/42903735290.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16087b50a1b098---suwugapikodumono.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/48008874689.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/58a808a8f537960759d49fcd6d3d1f7c/63765740011.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/24913991891.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/9304119885.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2fcjeiav1f2dugps3cpeh4fs06/42656141849.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/64412468756.pdfIn PDF document text
    • https://bczenekar.hu/files/file/kabow.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/47962945390.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608089bee89bd---wekuvitupugawa.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/fofezaler.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/dc742f0e414695e8df90607a41369d78/19907495405.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a694dd1be0a---tozulukabujuwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fender+super+champ+xd+tube+amplifierPDF 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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 17388 bytes
SHA-256: ccad9c73d768a217717e1d14daf1543a3f7e6b7eaf6bc46d20ab451683afb0c4
font_01_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 11084 bytes
SHA-256: c70ce077e271f1c6a997136cb24550c497ee95f97c861fcc733f7836f2ccec52
font_02_sfnt_off00013ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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