Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e04c45e31c2f84…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 02:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36c8608fdf100e1aa4e755e5488a5d90 SHA-1: ee51c5baadc0f3939b70a6f36221702094b900ce SHA-256: 74e04c45e31c2f840130ec09ec90e8d5a8a618a45cefaeaa4f74f27cdb42586c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some hosted on compromised CMS upload directories. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The primary function appears to be redirecting users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crosswaysrecruitment.com/userfiles/file/44042021124.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2702de64a---99162941382.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/39578572325.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/gevogik.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/86af5d7fd70da467fecd640099e8f7a0/bokojoxenazamakoxipu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ubdmh9km0c70tvhs45ktfp07v0/49562150542.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7faedf23f---63638361908.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/xupomirud.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/jigozo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/7cebdbe42a263f4a509ed1aa2a53297b/towetawurivunibiduzal.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/89jfplqnvo7grads7p91kphf53/jajaxegaxab.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809afda82a3---99713019373.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/ledekopogolinizu.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/64312528102.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/vusuwozugavigix.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/34206999575.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gixide.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/7461240453.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/jowagatipos.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/tukidapuvagejuzegoxotejow.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wedokegikapog.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/10629979893.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/jenek.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/velesedoxor.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/domoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=worthy+of+it+all+lyrics+and+chords+pdfPDF 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_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 10692 bytes
SHA-256: 4ce18104a69e934243a190d75d0ebf07829b9b1769bc154b8895b604de51212c
font_02_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 18240 bytes
SHA-256: 67dbed94ae327054768cef725b49f53757a1e98d223d78cd8a941539b5cd23ca