Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed4c7ace1781948…

MALICIOUS

PDF

76.7 KB Created: 2021-07-01 18:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dadd0d1fd3617abe17fc6b051632dad1 SHA-1: b1b55c1c1bda2f5598a54ccb319cfacbf60c351f SHA-256: 9ed4c7ace1781948a7930725d2b4d3f44840a05020c8c72e74829fcf256259f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6639275ae4---lojezijot.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/fekavivutobosudurevizuv.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/farevobixufinipavib.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/9419300c22616a8a739f984e35a46da2/bepalugixirosufivegitu.pdf
    • http://zhouzhuank.com/v15/Upload/file/2021626224628416.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/03o51p14tp495s6ab3ekinne43/tupatigixoguj.pdf
    • https://sweetburden.com/upload/users/files/81577191014.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8edc3783b014fd80468a787de903109d/74841317203.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717667962d4---88760853364.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853df0b30b7---31598809038.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ce99655c5e1276db6b7573581683e734/77979787116.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3df2c8570361487b1ff8e8a254d9fb16/tobivajonowolusanurikuk.pdf
    • http://whuntex.ru/userfiles/file/porefuvapekobojibizavamip.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160816fe5316af---80386711948.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac468d215e7---66106849061.pdf
    • http://thevisionkharj.com/userfiles/files/72277538047.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eaca9da5---74490569716.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4657ba54212d25636a5396559d70eadb/gusadakinan.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/35357466135ade19e27c06a288f3032a/14497358172.pdf
    • http://grupophi.es/uploads/files/nesava.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2d2959d1e484dbf243c6bf8ab8b0c9a2/voleto.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47ef5ea032---sozol.pdf
    • https://sport-jicin.cz/dokumenty/sezopomolumimefunukusoru.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fbnkc5cfmjo1r2i433ngm94do/mimebutuxewafaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=r+subset+multiple+columns
    • 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_off0000c802.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 16792 bytes
font_01_sfnt_off0000e014.bin
1dffb6dbb9d89292bc6b9cdf8eb0ba873b46a70d58d7d9fa0f9efaf7967af1ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 17408 bytes
font_02_sfnt_off00010dd0.bin
0582f3b3611c7a0b573fe6b4fb30ddcbba11cfc26a9ee0da7cfa1169024c30cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 10556 bytes