Malicious PDF — malware analysis report

Static analysis result for SHA-256 62399f2e6e4021f3…

MALICIOUS

PDF

100.2 KB Created: 2021-06-28 13:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b44be2d909fad04c68f26a532448e820 SHA-1: eb6fd49be3825ea86cfa3f0d7a788f9d5360e263 SHA-256: 62399f2e6e4021f3d79bbdc90d8a90ffbe2d272c87da26743f3e67ef67e8d82a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077d366e2897---57772457555.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7b98f07339a120c67ec8943909550cdf/zapajitajobaza.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d190a6bfc19---87054932481.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1562b3107fa6c3070ed564c8aa33bff1/fowip.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6urjis6d0stv1io7f3eoeve0b7/susiteziwomobaj.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1tfk5m096nkq013lc60bl5kekt/8267209497.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c962d8dec4a---gilanakixiwufemid.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b186c418f---mewolisupemapawifunuvujas.pdf
    • https://relans-nn.ru/images/docs/file/lerukivuvonerum.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4816d46d4---zemurodegakajodugeram.pdf
    • https://daismene.it/file/26074635048.pdf
    • http://anthonyvienna.com/sites/default/files/file/pigiladalex.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80a4324abdd2232744818d32ae50de3e/sevodevamefo.pdf
    • http://guojingmall.com/userfiles/file///noxose.pdf
    • http://loaamtran.vn/files/usersfiles/files/70995756946.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086714a3b5e5---23954808940.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f193d874fe---gevoditotasusiw.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/fipogenawumajitifaxuvezo.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/78335303277.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jm7sd2kl695e2no7dol4vtshjf/7819954921.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/21946120212.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71314a5ecc---rerixurifubaxazusidege.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160873f07ef6c9---12843391296.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/20e89115bce19f62bc9f3c15ee742068/84596779314.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2f03a891---61106637876.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad536b36e---21865386735.pdf
    • http://omegapizza.net/uploads/files/gelugesobarorarugitawafus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=independent+events+vs+mutually+exclusive
    • 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_off000122bb.bin
1cff56f4f0183f5afafc1229021cbe483d2f1af041912fd9597c91047877d4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 17504 bytes
font_01_sfnt_off0001508b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1508B 16792 bytes
font_02_sfnt_off000168a2.bin
da2fe4f7b883da7dd044b2f4c81be6a3323eff0255e3f4b5937e89b4863e3658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168A2 10788 bytes

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