Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfcca2852f36028…

MALICIOUS

PDF

101.8 KB Created: 2021-07-15 12:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d37b58f0fa30ec857862c1fccd563e93 SHA-1: e8451a4a8b28fcf3edf74c7429430f00f5959ca1 SHA-256: 6cfcca2852f360282c322597f9cbc3cbee5a1cbd282090a3873eae818654a1c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://infrive.ru/uplcv?utm_term=free+fall+on+planet+newtonia+answers PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f68b072d---rumuzalajekis.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9fc2dcc9---fugodemonilutavaso.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df635ba71a---panisujubozubonafek.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c166939c90---9635527310.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160862d0861f71---gulagejedazisowewugorive.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f938c30f6---73931423610.pdfIn PDF document text
    • http://alkanboya.com/files/file///51020755129.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/32931939800.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1b06efe9---kutejagijax.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f40c788f---13003275182.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b684b9c9cf241a99ca5bbfb158b713e7/bupoduf.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc4ba40a0---niwoz.pdfIn PDF document text
    • https://songhong.info/userfiles/file/43486964310.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2899c09f---6437432201.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16241686181.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/fizaxefewunudezexufoku.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/46224818175.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/85df9d9feac770222811b30c728e8598/22683493450.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1578f619---90073470112.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c6a6d9fa---12667266716.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wilobaxixuben.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/db0f728cb6cf354a7b7c57e523ec650a/37065126034.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/tosagusivomoleponimoli.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_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 18384 bytes
SHA-256: 68df555aa373593c39c46f6b678437d28fb1457b7360ae556647a7ac04cd1e8f
font_01_sfnt_off00015a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001722a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722A 10412 bytes
SHA-256: 86b844cbc11df10fb72fc2ddef2ef57ee1b33b1b6a8aaf4cc064fc9ab7dab612

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