Malicious PDF — malware analysis report

Static analysis result for SHA-256 8749a0779bd33978…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 08:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47a73605c676c265c8939c8b222a7d61 SHA-1: 50bf400d36d54426841b2e36a14153ed987655af SHA-256: 8749a0779bd33978e6afee0c77459f9deae84450128a91fa0551d87a8d176b80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous extracted URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://cecprint.com/images/file/8745349025.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c4bf9d86531ff8ed7e0735b4eb6df3f5/vomiruvulozisejidubuz.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/96190354576.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/96522935653.pdfIn PDF document text
    • http://uchid.com/uploads/file/62147805832.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/83888905054.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/86546264726.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/75629994718.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090717102545.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5fec65bb---42793443449.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/737241284.pdfIn PDF document text
    • http://geodez.com/pliki/file/vigofonuwanugotigami.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/rexukuvebedixu.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/25207262495.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/rowevi.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/religomotimefigilukaki.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/vegofagobile.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4e5eda1408ebb6fc9bd7e19c35d549c2/28745221479.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zemexanukamulomex.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/60660373157.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/90535108.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/97635935772.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/34733895823.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/58723426998.pdfIn PDF document text
    • http://kisito.com/userfiles/file/37205427576.pdfIn PDF document text
    • http://master-br.ru/img/file/63278595551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apocrypha+pdf+free+downloadPDF 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_off0000b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54D 10540 bytes
SHA-256: ac296bb0469105ea4738f13e8837d67a820f3e3821bf2db587c793d248d4dba5
font_01_sfnt_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 14808 bytes
SHA-256: 3c752b16c61b8d8d63f5d8d4acfa8dfa23508998a0e14ab713ab7a058b929c8c
font_02_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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