Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ce515eb1c7f1d5…

MALICIOUS

PDF

94.6 KB Created: 2021-08-14 13:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5025c390b0f92b0d5da0c1c0b940c818 SHA-1: 198166370cb1e1217fb2f9cf24c0d63d9a67d30e SHA-256: 52ce515eb1c7f1d5adc7efa92c2ff515db8a9f7978d47fbc61c437e9e9f9bb63
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, including one pointing to a raw IP address, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fcvperu.org/data/fcvperu/userfiles/file/96196745313.pdf In PDF document text
    • https://classconnbio.com/img-jacson/files/99433035997.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/93ec4dce2681a32421ebb72604446223/nabixomavalowotuneruwade.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c4bd0d3065e852101e99d5c94b059ebc/87637239763.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7f77e210a12f891b295a291c51a64664/xuxatiwi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/9457795115.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/292b7fc7833f68e1007cc34ffe85a0f0/naxonuwutagapumuvurobaf.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a04e52ff3f---dusulupixemagotudob.pdfPDF link annotation
    • http://kartinatv.org/uploads/files/tidimuligidari.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e9qasdhgi2qv6lhqo04v0gat4l/bejekuni.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/49b9f038957c49389c6f8467fe8ef172/92413196943.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/xinizasanobogu.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/joludar.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gubiribeferowejid.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/teronigobekorugupuxekuxu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b48a6ca9a---1810516563.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ee6e8549---tamerikugapifolimawuron.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fadef4e59447aba9c8544a8991fbbc1f/56898317605.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47ab8f03c9ed401d7e317ac733ebc859/58443057804.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cbac0fa3521---bosurojupudurisojinasebu.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/45929777557.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2035957606---mutunevakavovelabodogopu.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/gikipenudaxebo.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/3404959084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=is+tour+guide+a+good+careerPDF 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_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 10448 bytes
SHA-256: 7f1d7b974bbe63a3759df219aad36614a4e6bcadd70f471674fe5f0213beb548
font_01_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE6 16952 bytes
SHA-256: a1cd4e6020669a7d65e0f677bcd5f53510b5b4b13c18ea48f5e7ab989771fed1