Malicious PDF — malware analysis report

Static analysis result for SHA-256 034498b5ddec4214…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 12:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1bfd7545cd8dd0c30d0ebddc38892e2 SHA-1: d43d6d461b378d8584429a6e550dc00b87d8daf9 SHA-256: 034498b5ddec42146e473f3387c15becc1628caa569608a7162013c3e39dd660
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of 'invoice' or 'payment' language, coupled with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kraski-chernila.ru/resources/file/14274382058.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/89824c47ac5f258d4266455477c89185/sutunopa.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608a947cb43c2---18463546275.pdf
    • https://takitech.hu/userfiles/file/wokojogegugox.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7f7a1424755c9d8697b4850aa6dd4a62/99367144318.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/wisalus.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbed5044e3f---vikosinuw.pdf
    • https://red-adlay.com/upload/files/timamarewuzud.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fg4giaddvfm59sgaemhthpda92/80428219554.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ed5cf35b---muzalamajatim.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5b7beda438c5167365aa2b2b1701826a/71833621696.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610febfc06a36---bodojepatinanunibobuxura.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47d23a60a---dujegerezez.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609332f6946e5---xelojutikegug.pdf
    • http://eventechsite.com/files/files/puwevalapope.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3341902eb2---fimobixusiz.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a5d3a1c5a971b6228250751ca64d0013/35300572313.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf21d1e5d3---50138813406.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086d31439ac6---96103265838.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acb8356d6c---kodafekonetom.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15fcebb2c---64178258273.pdf
    • http://haozuowenwang.com/imagefiles/file/53564423991.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pan+online+form+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_off0000e032.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 16792 bytes
font_01_sfnt_off0000f849.bin
de21e26955b904d370b935957c001e803d51b9cd3c965085907481e91c1f7aba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 10396 bytes
font_02_sfnt_off00010fa9.bin
f73f50d7905aa2cdb989fbeffedb49bb820e8e78e169180e9c188fe1a748a097
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 18392 bytes