Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a9dcc131f1d9c4…

MALICIOUS

PDF

86.3 KB Created: 2021-10-19 21:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 15619f8ecd0439778a17bf76b8888320 SHA-1: fb2d1f2fbe67eb997e363acbc1a472dd0320d6a2 SHA-256: 52a9dcc131f1d9c4e1c2db43bb6ec9fb4894fd1e2fabe44a6298663a6002d3fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malware or lead to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • 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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613960497d121---bifunog.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131556d88f64---62424240096.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/79319283840.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300b78cfd6c---vodeditix.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/75690063353.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/rakowoxozofizijorajato.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161450ed0c9706---41341680620.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/92763176938.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/fivozipusabimelidujokate.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/fiwifaninigirojodikinimef.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/50055744143.pdfIn PDF document text
    • https://termofriz.rs/files/puvawo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161362ce3dca77---21474465258.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/jopata.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/22146861125.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/96974558995.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/43515703755.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/10950523781.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/52226110531.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/tijotejiperogereporitol.pdfIn PDF document text
    • http://word.mn/uploads/assets/52134261475.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/borewa.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/sidavufafotoribafide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=resoluci%C3%B3n+de+tri%C3%A1ngulos+oblicu%C3%A1ngulos+ejercicios+resueltosPDF 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_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 11116 bytes
SHA-256: 54f3c250569f924c2bc5f0c39d13dca987206491469ff2b0863c9f2e4ee1bc88
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 24356 bytes
SHA-256: 4c58c242f9bb84e9f534b0c396f784a260a2b50c1fa4dfbc1c13a278ebe415a0
font_03_sfnt_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832

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