Malicious PDF — malware analysis report

Static analysis result for SHA-256 2044df121a8b0483…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 23:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46e864b2cd4e9ce122d21d58005cda58 SHA-1: 3fe624570dba6be81e0b1a26b40b8138965475ee SHA-256: 2044df121a8b0483e27c093b2f3462eda3728554c3aed655240a85ac84de1e0a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. These sites appear to host further PDF documents, suggesting a multi-stage attack or a method to distribute malicious content through seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c60e79db8---20446228321.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493377170b---radegexuximekekinake.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/bffcfe658d50e81aeeb9b9b58129fefe/83005189482.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612700a8239a6---poxiwenipuwimomu.pdf
    • https://maximatrimony.com/ckfinder/userfiles/files/75751920784.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/59843906628.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097dff4c3a97---5759768731.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4e4d4f55---rafajakek.pdf
    • http://meta-min.com/files/68545789378.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87d78b9a87---90505978501.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bcf4j8qq1vko34h4pdmrne83jc/88509974235.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/6141994199.pdf
    • https://mszukam.pl/dat//file/dewulaxijatefemiresovevun.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115bdb0ea673---sidugusawujavanisorimuxi.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2ba752565509dd2de13e7f840a20508e/24843346682.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d64acf571---govaf.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c5u9h11vckp64a8pj7hocjhthf/punewatebukutuvinepela.pdf
    • http://alexlunacoach.com/img/editor/file/79205423511.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/47852453616.pdf
    • http://safedoorsystems.com/cmsimages/file/42256296752.pdf
    • https://bonekarusa.com/contents/files/95028761295.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/113156397.pdf
    • http://igigeothermal.jp/userfiles/file/89843953917.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/e29560ffa7b24627529184c00a2ebb9c/27245767550.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=define+operating+system+and+its+functions+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_off0000c938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 16792 bytes
font_01_sfnt_off0000e14f.bin
b7fab0db618a87c1a988637921a2e95c4a7825c653b7b88ca1a28ba6941f5d46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 11132 bytes
font_02_sfnt_off0000fb20.bin
2ab2b34cb5af907608b8beba280b80a01703a2cb01fe534300dcd2ff0757eb61
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16036 bytes