Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7edc703855fab5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 11:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a5a176ca65cf95c2e039b9aee516c22 SHA-1: 16304811dec0b0c9abdff2c5e619f53aecb14066 SHA-256: ee7edc703855fab51f9a00e35053d752cc28226264cfb365b1ce52f0ea76a1da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests the document is designed to redirect users to malicious sites. The primary function appears to be acting as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=kingroot+android+version+10 PDF link annotation
    • https://anmoul.com/userfiles/file/92560493407.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/55761280950.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/22009298436.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136475901413---92780179503.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109200949428687.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3437bc119---tadowogedobaxe.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/90595367089.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///62613178370.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/48480153193.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/pofezava.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480ba6791dc---34615649446.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/rinapibinuzodix.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/42343060553.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jijomunamizodore.pdfIn PDF document text
    • http://fourfoods.com/images/files/mitesavujodowelebulogused.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/91317007452.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/lonigaworetuserekumal.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/89380607716.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/45359813741.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/vowubanuzudivazek.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/18144137368.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/65103984315.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/97604546157.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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 17764 bytes
SHA-256: 64278e48bf5f1f34af8b700fdc20aefbdea79d4cbe790aa8e59ddf8872c84a58
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 10608 bytes
SHA-256: 1a480606e7c69446f23b7af3efdccb281c962846b59d44e618c58675d11b035d
font_02_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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