Malicious PDF — malware analysis report

Static analysis result for SHA-256 effd768f320d45a9…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 21:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5653ed0de651aa4dbb439f9eeac210f SHA-1: 47126bc83691cf0202912d1bf503e3421ea12072 SHA-256: effd768f320d45a9856e2a419cbbd485ded11c24715908e2a652f514f99d1187
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to obscure the final destination. The presence of these link farms suggests an attempt to lure users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c50d0ab87---zibuduxeto.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/cfc404fcc229f3529d511c71f026a666/kifofipililupewigipazijuw.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/80868586291.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/17206332d70ee2a392d690f5ee64ae1a/degusivadozepilub.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec47e759c---woxokimuf.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/14104422433.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607290ad1fe80---lomevaditoguzap.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/78240858656.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4b67c924---77500652330.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c03c4194---rafupesuwilewoja.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b296a3d00---96370307636.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/28688700037.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d97e85a55---67582658375.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/djjgm8o6ums4rbfradj920irr4/29653203713.pdfIn PDF document text
    • http://51www.org/uploadfile/file/33a4e309b940336ae9adc978e3431734.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fdd799c---60309123573.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/55ddaac44de5c7567da3e9969fc08825/32640498248.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/r676a9g3vkf60r2skv7gljtfd0/2055159539.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/dodabejukolasezepez.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/89017255749.pdfIn PDF document text
    • https://2acontractor.it/images/file/69514791070.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/9225453493.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da91a1bbe---wobitaj.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d225b225af2---23722771692.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d317b462---27798519314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=console+wars+book+reviewPDF 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 10416 bytes
SHA-256: 634ca8373766481eff8d62c9357b70bab7ca586d15146b7a61ab980e817c13af
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 17320 bytes
SHA-256: 3dff99e876391451acbdbe9e617acfc09f46b037a2e634a5f79d2d8d981ed0f5
font_02_sfnt_off00014664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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