Malicious PDF — malware analysis report

Static analysis result for SHA-256 74562bcd422482b9…

MALICIOUS

PDF

106.3 KB Created: 2021-07-27 21:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4fb7493a3ebcc0eb6c8db65bb2641428 SHA-1: 4e5c3505ae524f66eb8bca21dbce34bc52420930 SHA-256: 74562bcd422482b9eb1a78e11ede357c7808fe304a351226e1c3ae5c52169b51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution, leveraging a chain of compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a430fa4236d84c7ca53b2e6042fdfc9b/tukefupinurepezovorolowiw.pdf In PDF document text
    • http://aygroupmuh.com/image/files/94014250678.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210628031612_ngdawn.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/sasasaselazuka.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vorona.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/45578412680.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8848722c5d---gapexonivinot.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fd0ec6cfd16cca5dd89cad4877f4fb77/xuxetaligerutude.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/sevunopapafowabisaxov.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87210513830.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5fbcc08c---83631251364.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdb68add6---wereduk.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/13555578864.pdfIn PDF document text
    • http://toonesk.com/upload/rifawazudebomeju.pdfIn PDF document text
    • http://minhanh.com/files/27081665285.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/23f010d226bdc2c3cfe6df9531e5cbd0/21772444824.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210611002137307380drgvga.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/57110569648.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ed016492---50829919725.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/62467878724.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0affbe5fe---pofikaxa.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42f6d3904---80214043882.pdfIn PDF document text
    • https://avenue102.com/uploads/file/53968495005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=navy+medicine+subspecialty+codesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 17740 bytes
SHA-256: 95dabc693d7ddfe8979718f0af11a77cd8fdb696203a8466d9b33681ff577e01
font_01_sfnt_off00014750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14750 10972 bytes
SHA-256: b8feabaf490537adfd0c315756de7d6323a0ae20e853dc4c558f537124c1078d
font_02_sfnt_off0001608b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608B 20540 bytes
SHA-256: df1385e5555f5f582360026fae7838068fe98a784e0cec50ce2dac8ff7e96a76
font_03_sfnt_off000182aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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