Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0b931ef242ce25…

MALICIOUS

PDF

73.8 KB Created: 2021-08-05 20:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c0b407566c02ae5150e10d8313807d4 SHA-1: c208196d7494d0106c132ebbe0f5fbc888aec379 SHA-256: bd0b931ef242ce255975c87eb272eacfc7faf23f32efc9a6ad455aabaad9f48c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=cisco+ccna+student+lab+manual+pdf PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/motinonikipafogerosaz.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/19859413367.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/jopuleziputibafibenatobu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcd6f2792---89537652854.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/60sv9ru74efrlom7go28cuil71/46969976977.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/757387350.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/69138888840.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/44bde308fc6f9452ec92e7ff4ca79eaf/gavopufuzedozejuwo.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/70165974159.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc9b43951---8807795925.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/91734925961.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/61007553335.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/xotogubenij.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/otm48lqo1klk54k8hqt2li9nl5/pikaguruvakajuloduxafi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6255001dc475162f6b6484f8e64eb871/kusubumabibomimezikejosew.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be7ec1ebb---14005114867.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/87d33eba75f1264f29cbe5af3e77e509/girofudideziladanazefogu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/61414672706.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/20253163407.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754836d0b9a---likejajajewonaxen.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/fetofufupam.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4kius1fa45048peeutmsui506u/1461563340.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_off0000bf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 10952 bytes
SHA-256: b9b442c241ae35ded172ae0c5812cc4060de8df40c44c8de5398dfbe4e4e1342
font_02_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 15800 bytes
SHA-256: 20e7d47c1a4d1a2126f4e905bb73c2b9ce1f48dd30d9bd81182f6001f86eaa0a

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