Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ef89fe4cd20226…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 03:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c488f45164300aaa3bf4ae1bf06c31e8 SHA-1: bf58df3668b277a5bee8863b28982bd37fea57d9 SHA-256: 84ef89fe4cd202269e23039f4c08f8630520021a3efbeb4a374d9443c93dbfcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=example+of+divisible+by+7
    • https://angkoronetour.com/userfiles/file/jupijigisosozifa.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088893def9ed---17990791794.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b323f6cf503---guvako.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ulr391lobo2ek2rcbmtr9q4be1/gedogepomulitekudodosar.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b3dc3d7e2165b99d10fc0cc592d47abd/44683394248.pdf
    • http://beiwendq.com/userfiles/file/28751280698.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3k27vfu0ete2gnrre3gfo0163l/24889949102.pdf
    • https://herfection.tw/upload/ckfinder_temp/files/20210619194926.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210622200958.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/56759910411.pdf
    • http://hasyo.net/files/file/81168888483.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/27048682276.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8d535afdf9182b84ae0762eb3403b0e3/xiderexirupidus.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d3103690---51006657045.pdf
    • http://vitanova-cattery.com/upload/file/43609300835.pdf
    • http://akcjonariusz.com/UserFiles/file/20069745568.pdf
    • https://indolabtek.com/Uploads/userfiles/files/34595656375.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92b6ae88e---7470202648.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6952880efdf3392565818464e1d32fba/39702345902.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e7470f252b63dfefc2f9e7b4a1cfa5cc/22287812904.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/n59pc1sgmt7gdr6km7hsf51sqd/57920162286.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9abc7b3ef6---likimanabogatolizowazevux.pdf
    • https://vestol.bg/files/file/62501027883.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/47225005435.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08e.bin
19d5947ff36ca4aef948a7a4c4c8deac86215f1f596fc04603ce5ca883464859
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 17620 bytes
font_01_sfnt_off00011e2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes
font_02_sfnt_off00013644.bin
206f6bde1bd00af5238912bc0fb48bb9e7dc44f1479a5671156d4de6e3bd16e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13644 10812 bytes