Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5eca653545d196…

MALICIOUS

PDF

76.6 KB Created: 2021-08-19 07:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3db5e7e1681a42ac6b4ee0b01275fda2 SHA-1: 45d4909ec72306a47a81ccd5e37b4071441c8d3d SHA-256: db5eca653545d196a85c19db0a5f3aa65bc648b60982941e31ad335501ea2752
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not provide direct executable content but rather redirect to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://alpha-cp.com/userfiles/file/72692154777.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/37d149889bb4c98f929c4026e24fe0ff/bigupifa.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/jujidopov.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/98b5c2cf2083ec3a064786cb56513506/7468154682.pdfIn PDF document text
    • https://airbays.com/userfiles/file/60404563539.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/62954773900.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d1d6e2f9---53538672891.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/selese.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f2db7e3ab---mezawapadixejekapo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/35988c54726551afd52055ffa68aa2a9/32663165602.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611a71759653e---14202982668.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/53915480473.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/kafoz.pdfIn PDF document text
    • https://actorconseil.com/files/file/16032611580.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/55272313039.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/33278292330.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/dokinewolukatozix.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ae5f1fa0---55994918208.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xebeko.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/bopokuna.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/56607070611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bahubali+3+full+hd+movie+picturePDF 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_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 16596 bytes
SHA-256: 3ac3a93332684148b550a7b7848eefae4b8df9be305ca839c6b2d347a4c276e1
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 11144 bytes
SHA-256: 2a9281795a62c0714d6a455656b95b98e294af57ebd6a7e99b5ec57a1da3e959

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