Malicious PDF — malware analysis report

Static analysis result for SHA-256 edaa3c3315e6d065…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 20:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8980f18514856f870a3c9ae92cc18cf0 SHA-1: 129ee0655524adc8953c2370e98af22c7b79c39a SHA-256: edaa3c3315e6d0656c50bd613dbe3d52bbb23055efabb96a59066b6519dcf65a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links suggests a pattern of leveraging vulnerable web infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://houstoncoinshow.org/FCKeditor/file/nijosewofozakejoto.pdf
    • https://ahreco.com/uploads/news_file/9062194172.pdf
    • http://inlovehuahin.com/file_media/file_image/file/53380661358.pdf
    • https://ladangmimpi.com/contents//files/vipedezusutufosil.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/svq4bqdutfglng64hcmn9irdo8/53748468385.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3cc50d1ef---wowoj.pdf
    • https://egyiksem.hu/uploads/file/21979026162.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48312abda---10181659534.pdf
    • http://kirilmazbardak.com/userfiles/file/navosezogipekiteloxav.pdf
    • http://nextgenship.net/upload/file/20210621162424257842.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf399ad87---46595907318.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d81467e2f---29276766380.pdf
    • http://msinziniering.com/userfiles/file/66593671094.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e775bdb738---valuv.pdf
    • http://aifamilyreunion.com/clients/59202/File/nokifupibuwoxugobe.pdf
    • http://planbmedia.hufiles/juzararasizufo.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607331fb39284---48322217859.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c3191d11---84777854852.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a571528a---filamovewororor.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085991c80d43---sorim.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3699501098cdb41233630a0232ff2eee/napoxujex.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee2a34b5f8---pemigu.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d76e2b72fba---wugumatipaxobe.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15323341e---malefikubavabelob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=trainer+lindsey+15+day+challenge+workout+1
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a7ceee253d7c4cecb7502dfc849587df/kerisubojizavobavisixadu.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_off0001019c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 16792 bytes
font_01_sfnt_off000119b3.bin
add169b51729b5dcad45fbe033631cd66e4cc19d20d3d7225709f68d9eb18c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 11192 bytes
font_02_sfnt_off000133c8.bin
726e5405f3eeb580114b15589efd4662ac1a75d1e1d9ea75ddbe082b2cbfcdb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 17520 bytes

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