Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b26c4abfeb71d5…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 16:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c8f8e57f7a1ad14279f6c94b784447c SHA-1: fcdc20f8083ad3ef182ef0cad01dbbe23612d034 SHA-256: d7b26c4abfeb71d53925f59cb9f6d8e5c4ccbd7e9130715398d9a27e6f4321c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://dejede.com/userfiles/file/popenegoburok.pdf In PDF document text
    • http://t-eamplus.de/web/editor/files/89927573791.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210924_9DFEA5BD2282263C.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/16722248766.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/5662470253.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jovafawi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0a72138e---9184520961.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/68301317693.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/42259325281.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109190104436258.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/30519602854.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/miwabezilagafudaxagi.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/dejaga.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/14974354868.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29514275363.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349dbbc8dbc---99521349653.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/laxazeruzunukusobepopi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/niposadutisedorosag.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/sifamumo.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/15066466322.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qars6poht9702tvedl66pt1rtn/67403484742.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/nemebuxutuleporapakis.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/97266593482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=new+total+english+elementary+workbook+with+key+pdfPDF 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_off0000ae48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE48 16412 bytes
SHA-256: a31ce2e04ae6a891395641eecc30022ac8610f82e51cd33af8400d453878264f
font_01_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 11356 bytes
SHA-256: 6b4fab219613e26d9aa7ffa6d34daab5c1245d9eea00f99a81dde2b2d4bc052e
font_02_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1