Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f7337baac5c23d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 16:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb44f96f40006ef326ae19793ad1bd66 SHA-1: 543c173bf2fb9bdda9400f2db2f7e61e7d858af1 SHA-256: 14f7337baac5c23df6bad46ff0b3c3166f110d25229be943f3a8a7882cb9afde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=film+venom+full+movie PDF link annotation
    • http://exim5.hu/_user/file/sojitozutuzupogivikagis.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dizusefazunamatinebix.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tojunuvokizonapebaxo.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/93642630602.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109080519331722.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec785410f4---20488573883.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gazozibetupuxiwutasokap.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e56e4daf6f6b48411e843838b9ba880a/bufijito.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/31983287575.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109061649065736.pdfIn PDF document text
    • http://olympusflights.com/files/files/4221551690.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/85726915226.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/72870746660.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/nudusofiropazuselulapa.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/53128457474.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219215295858.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/namaruxexawalavorib.pdfIn PDF document text
    • http://enricobarraco.com/files/36438123147.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/87592855380.pdfIn PDF document text
    • http://twilaw.com/files/files/lafulujodetofetisusem.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/ramibowizukumuwadolevife.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/22052266107.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/9103363897.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32315992413.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2109e94da27e49d49debf4c84739027a/17030524385.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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16732 bytes
SHA-256: 155cb3690e4ec8249706cbde5ab6647b6274b276298bc46167b0779a680b90e9
font_02_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 9992 bytes
SHA-256: cda76ef480665b5f6e4e05f0e77f01872c50a751c47a6d3ff17194da55958a17

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