Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1a5b2f90227b93…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 08:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a746a9cc2a3b6cc7ff1cb1ed47044b02 SHA-1: 87633bdd11abc76130de01df110307cb922f3b8f SHA-256: 4d1a5b2f90227b936ccd4dd1bcc31ea95917b14503ee530e3f51b316cd9009a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the malicious activity, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://synerhu.ru/uplcv?utm_term=the+rate+of+change+of+momentum+of+a+body+is+equal+to+the+resultant
    • http://bebaldebaran.eu/userfiles/files/18468839939.pdf
    • https://pellevah.com/upload/files/bimerewixig.pdf
    • http://toonesk.com/upload/66491093469.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/220e7a502e2d089404e59694feaf7f05/luritekewo.pdf
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/nigorireluxatelolav.pdf
    • http://zhuoxinlaw.com/userfiles/file/20210903011056_855076591.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/dasexuvawinisevoril.pdf
    • https://santehsevast.ru/userfiles/files/72661470804.pdf
    • http://m-s-g.ru/userfiles/files/16367610560.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/94236279953.pdf
    • http://netmutum.com/userfiles/file/busiwinarolaf.pdf
    • http://hkwwta.org/userfiles/muwitoturakajo.pdf
    • http://biirbeh.mn/images/content/file/14927069071.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5e2d05cad8281b91d58633353f97fd3/82357299488.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/46412740182.pdf
    • http://nineslash.com/user_file/file/serelazigilamuziv.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339bc6d1c8e---bojid.pdf
    • http://retrolondontees.com/userfiles/file/guzepazixerub.pdf
    • https://oxfordjsr.com/userfiles/file/51979358014.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/74411471150.pdf
    • http://beiwendq.com/data/attachment/file/98549021750.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba88.bin
9d25b9ace40c681a9841f9d2bb8ae2984eec2edf0ecf1583101cc81d59858082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA88 16756 bytes
font_01_sfnt_off0000e583.bin
b9a00b4e5294ac3b70b5b4c293672bcbd27cf8ce5cc01411d2585f8f417179cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 11388 bytes
font_02_sfnt_off0000ffb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes

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