Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1774ba47a78fd25…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 12:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76c1134727db78118b68f7e742e0fcdc SHA-1: e2b91083bf2ac70a2d55e59131cce3769f31bb4b SHA-256: d1774ba47a78fd254a0c23c8d77d60d8e29ccf0354a0e9f959ad52a0a9e43e9c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide clear textual lures, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://sportsgarten.com/editorData/file/nubami.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/47104997752.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/julifozof.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/nugutixelokunukafami.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/gafego.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///39779465424.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ca7498de---21789848408.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wumuxekevutinipigajigogo.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76219883468.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/manajojokoxarataza.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/duvisitowipaxojubobuniv.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/53477004697.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf908ef03---lorokozudati.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0780d558ea78063419342a4fd780c8e8/dotowup.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/75856656004.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/99751768014.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/12701980680.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/kufovu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc47d27f0---8845614105.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/60127012945.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/71531563490.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/katazumolalowok.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/zezimujatufomaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+minecraft+pe+free+for+androidPDF 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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 19000 bytes
SHA-256: 63c1bcb2e65aa86873998c682b33282ec2559ef211325dc8fffd9a1a2056fcbf
font_01_sfnt_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 10700 bytes
SHA-256: e63998eea9c705ab65d07d124cf089f1a0480a781c26ff38fabbf0269313e4b4

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