Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa0fd53026aa064…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 17:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f56ed9bbb6de600e13656800db539185 SHA-1: 5515734afaf1961e4321c7521dda1604c81d1a1e SHA-256: daa0fd53026aa0640747560268fbae761a31b0f9d4bf4dcd84243deca9e180a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ketchas.ru/uplcv?utm_term=biasing+of+pn+junction+diode+pdf PDF link annotation
    • https://landatur.com/files/galeria/files/43243390405.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/wijagudajajagafav.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fulodutodowawizonarim.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rmatdvauhqphg01570j15sdcj3/molawomo.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16206178980084.pdfIn PDF document text
    • https://dukupahit.com/contents/files/wejamotovitonibes.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/pajamaredizuniwiv.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/famujaxozexigivo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088667a9eb98---tofufosokikokazegezodise.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091649d33482---tedatidepakuma.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xetapoxufojugukef.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0d3ae8917---28522070408.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/bopuzebifibokudifujeg.pdfIn PDF document text
    • https://eventaipei.com/upload/files/51305746367.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/9231e584661d6d251db11fb9db5ab19e/96138812465.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/kobobaxubadi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16123a88019682---biwivawivajozoguxes.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/puribimurepitagulubove.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/35559664621.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a849a057306bb6ae663d8cff62f78c8f/10688423187.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/7231389483.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062221203270554.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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 18508 bytes
SHA-256: 10a2b8c2697eee348d483a8534b5d2e3ea126c10555dfbad4087d2f4cfb34883
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 10932 bytes
SHA-256: dd7257d3396a8c9f16d153e243bfdd78fed388b8e390dc4682187b5af61c8356

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