Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a867f91fb69f6b5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 03:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d892cb2eb9224d1b6f51e52cd70452e SHA-1: 9830c34146e795740605c7198d25d8e9668d2c5f SHA-256: 3a867f91fb69f6b595183427ab54c5f04dee36138d350a821c007ec7437965e8
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 functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs lead to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of these links indicates a likely intent to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artlabjo.com/userfiles/file/72781316370.pdf In PDF document text
    • https://suruburi.net/mm/file/jobojoxikunelin.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b633be4ed3b5cbad9d7913c7b0200a23/gajojopajinenowuzijuvitel.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613398ee76df1---wamovet.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/19015464963.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/50241901440.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/86395406578.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/56120690830.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/47069075449.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/zumomizoduzi.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/zugobadatisagujorutato.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/wejukizenukeja.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bkqm5aok7qieceruik2gl66g9s/wipop.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/runatanotodosonaje.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/21513163369.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3278e75bb307c50376cb11f1ff106b0e/28463615317.pdfIn PDF document text
    • http://na3.it/misc/file/tazedizofitotam.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/75718252145.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/92122899783.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/97007084065.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/jitufigewazafoletapi.pdfIn PDF document text
    • http://szpk.hu/_user/file/ralukexuz.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210910192523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=home+design+3d+mod+apk+full+version+downloadPDF link annotation
    • https://easyown.ddproperty.com/datas/files/fajedekefojegusab.pdfIn PDF document text
    • 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_off0000b067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB067 15308 bytes
SHA-256: 69beff9e0b62c0ff34876454bf1c58598ad67d03bedcf79ab55b3e64b49461f8
font_01_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 11248 bytes
SHA-256: f99f612304ad992b8687ac679be421ffa1ab28b95db4837e728fac1206d6586d