Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bef8e7e5db8a92…

MALICIOUS

PDF

74.2 KB Created: 2021-04-30 12:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f1609404160a24122562f9dccfc8a39 SHA-1: 60ba4ea10d14a2336174c57d49ccb040b634e28c SHA-256: 56bef8e7e5db8a92dcacb48d375a7363217934a73c95a675319fab7af03aa820
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9741

Heuristics 6

  • 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.
  • 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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9cc39568---80352683726.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/33bbrsbf23rcknnddgnal60uf7/tebesunozoz.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/799ekp0e9u7591qeuhvl00s33g/lolekejomuretodif.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f512d199d7---48755496533.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080a19aec863---tipunovepavupirimedafi.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cbaddfa00f7c6b397e7e53e42ddc591f/74804457548.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/35ff6ac1d0ac0001e4e465c6355fdcf2/jodorutuvipuwoz.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/faf814de793620f0823308b62d5cdd7b/zudonoluzun.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45a2019f3---xusezimoguxuluwup.pdf
    • http://ahchala.com/img/file/betibebapo.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084478cddd5a---lozozilakalolob.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/98d645aee151466b0b8995e2bbe7f07f/xabemoki.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f972f4ed0f---84014706059.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/ecf13faecd85ca09fcb8bef7dc654e90/rexezeresusebuwirub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=abiudi+misholi+siku+moja+video
    • http://scripts.sil.org/OFL
    • 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_off0000cda0.bin
4d2b601623b0609f71c0e882da5d470ef3a6ccd1ef49875cabf72f27b44678b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 5300 bytes
font_01_sfnt_off0000df84.bin
3386ba6e351edee4b55cd7f7c38b9551b9cf7b2ea6c15c73d5c0a2de1ec992a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 11276 bytes
font_02_sfnt_off00010554.bin
001d00114279cda904ec87ee5caf81ece5266ef333c342f0ca5ce216f4908131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 18776 bytes

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