Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52dda7011eb967c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 06:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 330a1cbb43453222737131af50e22938 SHA-1: 94aa910b72defb774f198e49de786595d540057e SHA-256: a52dda7011eb967c1a2b219a1c7cf931eb5d008a4c29aeb005fdc23e267fc6cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. This suggests the document is designed to lure users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=adjective+words+that+start+with+u PDF link annotation
    • http://antansconstructions.com/ckfinder/userfiles/files/62834141488.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/2849148516.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/56859619776.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/tufamurikabifabekex.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/47124688997.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbc2314ee---mukusepesadokegob.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/68920165344.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/56375193632.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/waragowasewuzavekufigetam.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_223403_121.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/zegofimejekidixerulat.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/75581374238.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/84417151290.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614471f55e22c---mekotutefixek.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/97834464688.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d917e77121---tifiximewojebidupasonopes.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/67798915679.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202199013107052.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/38921419901.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/70324986839.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/81656753743.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ec631d5f---92119291249.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/67397647234.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/63882762684.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/vavonibifove.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_off0000bb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 16128 bytes
SHA-256: 287d2c11ae25ca46ac908ef4d1715f338c51e9b1f9def1c018aecc7d23cebb89
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10680 bytes
SHA-256: d7f9d58bbdc534e5c9db0dbc564e8c8d913978bab8c4f4794d157e4c6a4ab701

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