Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01cc7b3d1e665d3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 12:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 897900ca414c41c82aee52f1902ab04a SHA-1: 1f67e27bbc9011c0a80a6a3e59a45dea0ce98d92 SHA-256: f01cc7b3d1e665d35572fad675b21d8b8712cca891af7a2dd918cebf9a6f2a96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=serverless+keyboard+premium+apk PDF link annotation
    • http://www.keizerco.nl/userFiles/file/xiropetemojek.pdfIn PDF document text
    • http://polletnv.be/uploads/files/dojuj.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/zebafomavutojiranovevek.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/79079786172.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb8abcd4b---pusepefuzaneveviwode.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f901df2800---kunaxofereveka.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/66602610833.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nekoxivuzevibogutag.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/patojajunite.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/rivixe.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/gowodox.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7e07e53a---77654955454.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c2ef789d13a655fd1f927fa9bafb5851/96120119271.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/87460855359.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909011759.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/32390583849.pdfIn PDF document text
    • https://samudra99.com/contents/files/50703922242.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133171282584---33328531492.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/retasosivupenufedurul.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/14545196115.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/63084217306.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/pobixerexibununuf.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/pugamunetufojaxidalazak.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nidesavolesarox.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_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 10940 bytes
SHA-256: b2440793060dea941b4609a20454396b90ba85f298638e160137da5819cfd480
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 17716 bytes
SHA-256: c488e573640b649d0cc813c0980b1003ccd30ceb69e75b92da41d73964b76416
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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