Malicious PDF — malware analysis report

Static analysis result for SHA-256 742b40f147e570b7…

MALICIOUS

PDF

83.6 KB Created: 2021-08-24 22:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11a3ea1b2f8355c1f75253307b97fd1d SHA-1: 9845667f13ed840cfae4a59b3227cb3e82bc2fe9 SHA-256: 742b40f147e570b71c88cd7f7c83767421d4fd4046bd58bcb42755e81b074076
156 Risk Score

Malware Insights

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

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 domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://2acontractor.it/images/file/lifufatagulaguzubew.pdf In PDF document text
    • https://eviinstall.com/userfiles/files/tuxaponusenejarikifixadaf.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/93057452890.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160970e610405b---32779182831.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720e75507d7---jonufujifidu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8c03ec56---82438405186.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/60769906953.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988569f0dc2---44631002388.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2af88ac55194d615795d1c169b34f529/73128004964.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/017b49a2330bcdc878f5101397084ae2/webawibanisegedoba.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/11quvcvmk680ljene9qt21ujeu/nenezesitepok.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/xobaxiruzowekuwelutug.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/66307255984.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c704c827f94---48821935695.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc494a467e---11254367852.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/tavevimimo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb1daa9c1---xumorapubozuzapekekarilun.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/779048d19b125e9ec7ba9e757a145233/vanipijaxufuxatenaxu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qr8h3rtt76jvmjvmsv7c7egs14/sukusuke.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210524161314.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/13480077709.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/16612557846.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/16b690df17f0723989b52392b6ec5b0e/33655250193.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/bubavisujoxilopunibobavob.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/75518482281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=joan+scott+gender+and+the+politics+of+historyPDF 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_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 16984 bytes
SHA-256: d401ffa2d9097cad21dbc29691e305dfbf513d39cca054889406b7339eed720f
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 11004 bytes
SHA-256: c17b73419636d3ec6a7bddd9f7714ac2738b71bc53b11d710a9e7f4714da76de