Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fa26fcd154a080…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 06:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f664eb5784e0657b4b1523d84c1bd914 SHA-1: 20f6bb57582f05e71ac439bcd99ce851cf34aaee SHA-256: 04fa26fcd154a0807aad6042ff77794b33637f1b34de7d745b2d5f7bd4c7a481
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for executing the exploit or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=music+theory+questions+and+answers+pdf PDF link annotation
    • http://files.ibiza-ferien.de/file/58536707845.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/98549021750.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/gowodox.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/kakanemakido.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/67729174667.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/71232288522.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/joboxadifijijipasime.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/wojofu.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/4160630079.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/novuzuzixibiketum.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e1b50cb2ffa03ea0b755480866272ab3/52583941586.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/xuxepisadumabuge.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/76797055323.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/vakobizufovagaj.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/65917687144.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10045124598.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/razezifedanisuvaniz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ejd58d4vrltvas8h39up3ee15g/46932299213.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161445b7bea499---87552757768.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/jokimewi.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/sinisepavopabadupuxif.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6fb13071---diwedewet.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/51573696058.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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 18056 bytes
SHA-256: 1d0b6768b87768090fa00e570bd3da3f3263715903f86d241d03bdf1752eac05
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 11112 bytes
SHA-256: 062781cc4e122cc61b0028be6d0041e24c9996962bf9afce673b26e72a8a271c

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