Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70a44125563ba2f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 03:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff44609d0feb67cd7450403c8744c423 SHA-1: 2883bc4dfa3fff10c68e8ecb36b062c46367922a SHA-256: a70a44125563ba2f7660e97ea36bd32d082d309b4f3fc91fff3e5b32642a76e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests the PDF's primary function is to act as a lure to these external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=download+emergency+hq PDF link annotation
    • http://elma-itc.ru/!upload/files/91366524734.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/17895742929.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/26845217435.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dikekunikuwezipabe.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/79865988165.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kolasasunerug.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/119477af2eb00e1d022fbaed1c743ed4/55817006475.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/fuvobevomexitufomapulefa.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/52622757148.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b5ee72e089305d38cbee3c15c50314e4/kobuxaxuf.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/potapegaparudisavagip.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df578569b---23352178911.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sosusosiwipuza.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/bijanekatobojogimoji.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/geximezibixiwotedanoj.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/csbln9h31jtmrv6h2c6l71l452/57159011059.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908040258.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/levomujuzalil.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tofatavorakoj.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/degiledi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131650cc511b---luvobetaregarobagex.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kigutusumabepomevorunu.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/97644882394.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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 10804 bytes
SHA-256: 8bd2253eeb4bd0db3658dbdbe8f4d8b23ebb82a63bf0141a26f90d35827811dc
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 18408 bytes
SHA-256: a2b2ad3b1991fbbad5453b770ffe741591780e92ab328ff2aea6114427250f5d

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