Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a406c264aac0b22…

MALICIOUS

PDF

126.4 KB Created: 2021-06-26 04:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f45e6490841400b6ed2824b2d4c74ffb SHA-1: 0d1a7461d41a9849392289f4adce9405e1819f20 SHA-256: 8a406c264aac0b22c672ae75a5d04280f50e140289675944cd839de3bca15cd1
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, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160814303ae072---jovuwunidarumidikixafajuj.pdf In PDF document text
    • http://nutranghongngoc.com/media/ftp/file/zakige.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kezosiku.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/05c8287e2dc03ddc1299b64f88e25364/damiv.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kv7r5av7ulncjfamg5b55u1l55/82430551779.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/zokomagizalebawa.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zataperapiwusemexama.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/sobeb.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/cirkilesei3sluvdra4opprkk7/zolakewaguwabagufuv.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6u1c60ool19sl59ou07hc104nd/29241368271.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2161b1ab08---56444675.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b0c064f750bb5517ef3427b17ea03c9a/mopisabudapupadi.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-10-11-30-29-38.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/lafulosuzuwapivenu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1dead0abd---mufawomagevitowe.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/37f405f8668405a842d45f16982aa3fa/xedosopox.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dumatanirikojifiwamatap.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/in5tlelcd22qb7aenhfj9d03v6/nojejo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/936d1813890146fc6840aded37bfc696/4897676819.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e55t8abajfin62sp365ag0q9ui/bavodiwij.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072daff06665---40701268601.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/mesivodumevufisivunika.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dos4cvvrvgmvfu44sou1ev21t0/wepap.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/64376932953.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/kakizebumonam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=in+classical+conditioning+are+important+while+in+operant+conditioning+are+primary+for+learningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18397 20152 bytes
SHA-256: a942cb3a762c66bca76d0b5a12320b7ccc22f7f7eddbe07a67fcdfb0a521c563
font_01_sfnt_off0001b86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86D 11216 bytes
SHA-256: 967e4a2852a2cd980a1f5983e96925b68909bdf001596abbb072594cc3ee5264
font_02_sfnt_off0001d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1