Malicious PDF — malware analysis report

Static analysis result for SHA-256 b149a6e07126c58b…

MALICIOUS

PDF

101.9 KB Created: 2021-07-18 05:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53cba6aa72eb99c6df947c1bb78e4149 SHA-1: d163d294c7a375b882d6b40430de10bd41025c00 SHA-256: b149a6e07126c58b320c41e36c196efc72187f2f52d3694604f906f2b3bbfdec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload directories. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8b21da14---65017195683.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc41a2cac2---bejinojifujez.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61e7de6533---26846420016.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7706fe422b---94743609198.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bd7c917fceeba02a983dde4e9c28ab0d/32700457691.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ef7d7422991e96a24dbc29ad1ae1e5d9/74980241883.pdf
    • http://iworking.vn/uploads/files/1555010334.pdf
    • https://mimpishio1.com/contents//files/bezesowutuzobetep.pdf
    • http://ncabhsa.com/clients/875427/File/11777844927.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/51277642751.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tovov.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q81mpvdtaut2il5kdero3u3ei3/97512940585.pdf
    • http://birnagarcollege.in/userfiles/file/jugarexosumukajabozozetej.pdf
    • http://ellerbeefamilyreunion.com/clients/874543/File/pikodipuferiwuxusatinad.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/75958367241.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc3a00abb---tirunupolefot.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/nawuketolowidina.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558eab3820---xedomewasununusaletas.pdf
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/webexutufisiju.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/80447817893.pdf
    • https://protradingindia.net/userfiles/file/vagiwidem.pdf
    • http://hayatteknoloji.com/webimage/file/79125882062.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9015942da---vulolijilitozido.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf7e3cbab---kepimi.pdf
    • http://dekoblickfang.de/userfiles/file/podiwis.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9908a47876f77f410854ede095fa6f6c/42685863263.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=high+temperature+tribology
    • 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_off000125d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 16792 bytes
font_01_sfnt_off00013de9.bin
86ae679ab06d49f17fa629c260c67fc717dcdb2188dcd166d92f715b8d49e0e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 19732 bytes
font_02_sfnt_off00017037.bin
854d183f7391cd9ab821fca6fea330d0630549bcf23d83d314322344923afe49
pdf-font-stream PDF embedded font (sfnt) at offset 0x17037 10772 bytes