Malicious PDF — malware analysis report

Static analysis result for SHA-256 490b4fc4973b34ea…

MALICIOUS

PDF

95.1 KB Created: 2021-07-26 23:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b115810d0bc66fbf9f59e5ed6d700d37 SHA-1: 27ffed7ad5b58ea2656390436c693cfdc9662a28 SHA-256: 490b4fc4973b34ea7ced407af5be6588fd2cf4bb35184261b59f59921a70bd81
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous unknown PDF files hosted on compromised CMS uploads and disposable domains, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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/1608aa629ca71d---86942091340.pdf
    • http://akinmedical.com/uploads/file/zaveborovelifenisu.pdf
    • http://czdashan.cn/uploadfile/file/2021042903143773499.pdf
    • http://spreewaldatelier.de/img/editor/file/savoridulimakubavula.pdf
    • http://akicgiyim.com/userfiles/file/92447588149.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/64922660251.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/4qc3g63qfojbn222tvmrsvd5k5/22039138410.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d219c726482---xukeludefojijamefuf.pdf
    • http://alpha-cp.com/userfiles/file/46926772337.pdf
    • http://sunrui-ti.com/d/files/79960972400.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1kpn9puk0mcgq4i8jv2rt4iak6/jijezeloduguna.pdf
    • http://kibbkw.com/uploads/file/fezokunoxuzazaxidud.pdf
    • http://richwoods1969.com/clients/861079/File/59123597651.pdf
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/gowuninitumotibivebufeni.pdf
    • http://mdsalon.ru/img/lib/file/xurewarepexuwup.pdf
    • http://anupbolivia.com/images/files/vogowokeniw.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/13951471469.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6f094bb4e2b40f9ee5c438ea0e1c07cf/76625061870.pdf
    • http://vhktn.at/images/content/files/80719224103.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2baa5ec2---tuwuvu.pdf
    • http://busangh.com/attfile/fckimg/file///2021061312649_733109103.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd15d015e---10426099641.pdf
    • https://annjulieskarpmo.com/userfiles/file/pogoniwesomapazigip.pdf
    • http://erdivigado.hu/userkepek/file/zovibeguvolukulepefebute.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5670a54c99---38171875581.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=shadow+and+bone+collector%27s+edition+us
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26d.bin
92ea941ae5cb8dc638ba22fb79b5a26b1b5cc5429d5467def3a9ae72c8274b9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 20248 bytes
font_01_sfnt_off00012718.bin
398f10ca950b78cc691df7b9cd6151d95a74d90c8ead2c2fbe281f0a6309a3c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 10900 bytes
font_02_sfnt_off0001405c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 16792 bytes
font_03_sfnt_off0001586d.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1586D 16092 bytes