Malicious PDF — malware analysis report

Static analysis result for SHA-256 73300271b8310587…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 17:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 749e9f4923d70d453e6a8aaa349c39dd SHA-1: 0af70fcba016738ccb618bc1606d9cd1b0600813 SHA-256: 73300271b83105871c140069418483fc7a2b5c42533ad1edebd91fc0fe2b9c85
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 links pointing to compromised websites and link farms, suggesting it's designed to redirect users to potentially harmful content. The PDF structure and embedded links align with common phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=how+to+get+better+at+driving+manual PDF link annotation
    • http://gibisch.com/files/files/pofujomowowubavuwekaze.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/gufalimefalamevaxag.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/14468938474.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/87975160560.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/60221673148.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/352b9dc040de3dfd6c9034e2f345b8f1/63286560335.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/8193421531.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/dezudijawezemamibu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/89025332661.pdfIn PDF document text
    • https://plasy.com/uploads/file/fivesikemeluta.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pu429o5cjlfsbq0bs51hjmenr1/vejaxuxafan.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/vuxanemezep.pdfIn PDF document text
    • http://mobiliteit.nu/files/26859382869.pdfIn PDF document text
    • https://sitarasign.ir/data/file/wuromabulat.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864d127d015---47661599066.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/mositefuwube.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f3811c2a0---2336060479.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a41874d7---nowoli.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49b118e91187f0dbe7747d1e5c6986c6/zovoralitireteri.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/95802651455.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nenadiwiw.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_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 16060 bytes
SHA-256: bc0468d47fd855e4f8daba5f31b3f3451db2a7e9a545da2271165f3fa91db155
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10808 bytes
SHA-256: 20d91dcb3704b152624f617da26b7fb65e469d6f93f371b36587c6030a084663
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1