Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46efb9c97bb8343…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 19:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4692711d3df7dae0b6735c2762db9af8 SHA-1: 0f1a148f7722260106ed646787fd17a5fcbe6ce0 SHA-256: c46efb9c97bb83433f486940af29056d951c5caee3ef670db0eefc29dff93576
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's designed to redirect users to potentially harmful content. The PDF structure and numerous external links reinforce this assessment, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd57ce61c3---ridek.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084760a10c59---51187536410.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/36e7515c19f360a166bb86b88fe37361/suporetilul.pdf
    • http://teormech.ru/teormech/usrimg/file/perixagejosesisefi.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/icefic36efegthhibpmkpvsoin/ligolixevuz.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609749924bc55---lujodakejutotazelozuvavo.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qq383p73ir0q4hg9onuelar9c7/47350935776.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16075921f5696d---rukamex.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca3b07b5b---55031013714.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c5d29fda---76092220172.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5e51ce2c---68729726180.pdf
    • http://haphadoor.com/upload/files/35626679672.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a134acbec95---29887594938.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99f2cd0f8a---xibukamememiromotufofe.pdf
    • http://15889163.com/ckupload/files/74379920560.pdf
    • https://michelbarbot.com/upload/files/70651290153.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/rafajibuxiwuvedanamusixuw.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d03c91dd---kazafoxipowukuv.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cac1e54a---kasazulomaw.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/79896725197.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/242746cdc179979a559bb18e7d297f89/wironosegurobunuvox.pdf
    • https://kolbandibileklik.com/resimler/files/wogewodiramewiwopilag.pdf
    • https://invest.pl/userfiles/file/28484937504.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8ceebef3---53682986544.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=greatest+popes+of+the+catholic+church
    • 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_off0000f5b4.bin
dd53971799c402756f3791a8a8ebf2da6c0c1c03da4d605ce91e64aee14813b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10612 bytes
font_01_sfnt_off00010e1a.bin
6fda6d37a0d233a1222cda213c8072944a87392a887ec81a7e8881859ab96ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17056 bytes
font_02_sfnt_off00013adb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 16792 bytes

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