Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7d7de4d9da0e63…

MALICIOUS

PDF

132.5 KB Created: 2021-06-28 16:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 753137c85c30acfddbd8e88ed396d733 SHA-1: d32dcf173f781ca9cc322af55e4510e2e2d63ede SHA-256: 7d7d7de4d9da0e63ca10ac250b1e6e611539b0071a530d7a13599376da562819
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d99450c4818---virefutasikewixinede.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/536542f988b8350e1a849f1ad9479580/2713757717.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f116a5dc17---50357193568.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/d2boqgjosffhmaos1otss1hmcc/porizanuxaz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb1b71395---67061382854.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pawenorunopiga.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2f87c623b24bc86287991aa515c84490/43683703143.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824cddcce12---1292136277.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/30f44fd0d86c41acb1f3277f7d71c473/sakejomikoji.pdfIn PDF document text
    • http://teknis.it/userfiles/files/46962733010.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zotokojumivofusadobexob.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/63730429925.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9cg4dsfjoo0gu3mbkedkrkm9kj/zololedaxunerotutixarusi.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/96017248868.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52bbb9883---javavu.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/47479934422.pdfIn PDF document text
    • http://riversedgefm.com/files/file/61296821140.pdfIn PDF document text
    • https://beaszemin.com/files/nesedejozekijuvilezere.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/51c90b9c972db1513a8b1175a30d8daa/25850236142.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/019d64dbc191227ce867e817821782ab/54673768681.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8ce207d548957965adc06082735fb677/95224247247.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c751a9abb2---disijan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=i+love+you+baby+frank+sinatra+release+datePDF 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_off0001a515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A515 10808 bytes
SHA-256: ea8ca5da7a36f9a66cf50c60b5e0bdc53291c45fbcda0cf436c29097b61c9948
font_01_sfnt_off0001be28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE28 18480 bytes
SHA-256: 43e94045ff27d050e573436d22a8b2c685d7af883e927e18954ed8c3b0ee1401
font_02_sfnt_off0001ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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