Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0851d88799bbbf4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 17:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79d7c5a818a17d8ddb916556369dd9dd SHA-1: 3b0a5fcc2fa5d8727bf6650980e9d3942af7bd8e SHA-256: e0851d88799bbbf4e0706590aff17e6623ac5264374c345468a487fd7cc40f2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://dorfadvertising.com/ckfinder/userfiles/files/29947391175.pdf In PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bagojarewivetuwe.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/27bn275icdsagqeb085p52ba85/dajevuxonavinexisunovi.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/12525966044.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367bd88d885---dezilolosidizaluj.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/vasudonojufu.pdfIn PDF document text
    • https://autoskola-scp.com/files/17037611942.pdfIn PDF document text
    • https://mackbeks.com/files/file/50670904527.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/64756697233.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/dawoxagudujudezebirok.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/60059610530.pdfIn PDF document text
    • http://generaldistco.com/images/file/redowiguzopazot.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/jerolotiputekeralap.pdfIn PDF document text
    • https://htchninc.com/d/files/wibopakorep.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/30893369952.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/bobusu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfbec5b86---migusujexomitiderelej.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/kulanuwirixulete.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vowumuguwujamifa.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340383b1085---jijokukew.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/semulowotimaxuji.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/550393975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=signal+symbols+androidPDF 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_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 18856 bytes
SHA-256: dfae263f978b679ed247046288aafedc1a1c3e61e951380dcd99a3f599aafdf5
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 10688 bytes
SHA-256: 4fc3b53532b0112dbd20f8e3677fdcf62991c92de848fc3a64b9eb413e63ed29
font_02_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1