Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f757c92ea47790…

MALICIOUS

PDF

87.4 KB Created: 2021-06-19 02:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b0db44e4fdad813ca5c551880cee06fa SHA-1: 14941904ea8e842fe0cd4b5fd2f020ded3aa6bae SHA-256: 94f757c92ea47790acf0ff1d8e78a70c397c81ecd0ab8b7522edbdc3a8f5c4c7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0082cc7fcd---95079890507.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803161b24ed---nasofe.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oi2gufe0a1loeovihjdcdpv2ho/wojajamofuwekujoxux.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608399e1c4cb0---voribafijibaxorumigaj.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/57752221998.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a823163f8---vezijas.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad0e81f68---84835142529.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160718caa5d4e4---jokibelazovusadoxupidom.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/12bc6de0681b71cda2c6149cb6504f65/pesexujepifetifefafot.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/7708371980.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wavijizek.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e55d54f911c54e6ea5468388b19b5cef/98473309757.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vsl674ev3192d7mgira87dgd1m/7513299935.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e4d43056---94437706316.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/78040253030.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42e5a2c5d---bekijo.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/90681273427.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mi+ma+peru+thanda+anjala+songPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f9af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9AF 23764 bytes
SHA-256: 628eed533ecdc11c4830d46a1c3b36a6576f6ea5ccf8b2df036a92cbbd1ad595
font_00_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 5456 bytes
SHA-256: b809c0c515a8d7ef85f69aed9a784049041d3c0bcc14fdc23de846edfcb97a41
font_02_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 10408 bytes
SHA-256: 37193192841f58643276f4b0a4569c1c79e35219fdbec6412e7aecbbbc7b9abb

Open this report in the interactive analyzer, or submit your own file for analysis.