Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7868c38428a31c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 17:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53518a3fa1ed40fd25dbbfc655cb0663 SHA-1: 41c578d4310298cd1ab118702d45905bdfb6b6f1 SHA-256: 8d7868c38428a31cb833c28d21bd0c3af23319563b3c8a35efe9b5c8aef48ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document's primary purpose is to host and distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=intel+processors+comparison+chart+pdf PDF link annotation
    • http://ecohost.ru/pics/images/file/tipolunugirugetobapoxu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7a5fb7adebc5a8b7095f162f404851ae/5247803428.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/469a767a4f58a18cdf6799241986cc90/37303314677.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/84224301459.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c362dee9fbb---38059737234.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/45286181672.pdfIn PDF document text
    • http://allasclub.com/campannas/file/16403038678.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dabebikozizafole.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/13272113408.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/36229525922.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae1b3acfa---xepavubulanelovapava.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/89106590498.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/57902541676.pdfIn PDF document text
    • http://trovas.com/userimages/44676469532.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/xuvekinejaluxomol.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1db87400a974aac0885046b09c7ffa57/10111942750.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952f8c9e54---nakiradew.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bqldie6170tn97ob8i52mur89q/77221073943.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/600e8bb7f0a848602b12dff793fa1e42/95424899843.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ln80lfqse8c7mdp6o9g4nsc0gj/55982928998.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kik7inq43stl49oatjkgideov1/gobulukat.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/33668748192.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/xalat.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/fba4cf38013e408720e964ebbb1681fc/vepofujefagesodusuguset.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/pokatixanima.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/74ec601553a6b9b82cf3f4c8fc59fe97/33264774195.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 18808 bytes
SHA-256: ac5e752b79a3ab3f772394c6cf4935f7e7bd53d87ca06b01f1ac79686b46bcf1
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 10836 bytes
SHA-256: f319389ae3ab96d5cdc2ececbefae772bea23663398d0d6cda9044a319276e0a

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