Malicious PDF — malware analysis report

Static analysis result for SHA-256 f001b2e1aa8fb81c…

MALICIOUS

PDF

85.4 KB Created: 2021-10-07 07:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b2db3f60da9c54bd6e2259da56df1f6 SHA-1: 586b3bcde92741848f0b58022d54a9387e715721 SHA-256: f001b2e1aa8fb81ca9acadb0a17ef5a541b035c87afad6149ae785ff5a92c325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=good+adjectives+from+y PDF link annotation
    • http://chrisdepanneservices.com/Sites/cds/files/6000417811.pdfIn PDF document text
    • https://nevisnews.com/userfiles/62848512431.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/31096390627.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/95110301415.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142b68a723bd---kefinovutalilemebikuz.pdfIn PDF document text
    • http://chetanaus.org/bheru/uploadfiles/file/pezetepotefibiwe.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/30b324630f748b29c7b444a179a7c173/22897564152.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/37858103467.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b4757048c1b37e092d2a82b0a4b3c863/98979404488.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff5dee9e2---kunatakupenapefuselepe.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/95970435139.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/10848132938.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/13kv5llajck557kbjcu1hitf9j/bizobirivuz.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jiwezitimonepezepilegunel.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/9941519961.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346d6bc5de7---79770917826.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219271526401648.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/69211593002.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/94888563184.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbbd61e18e---85944726307.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614f51e6199a1---74987757373.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/18031130634.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/xemesupetigitoli.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/fugifawisetenagevag.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/pegafoko.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/42584710756.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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 19524 bytes
SHA-256: 93e84dd13efbba78f011ec969d6e5f3044111a87dc6538355b433bf85332dbc9
font_01_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 10836 bytes
SHA-256: cc984c7015c1d7913c8381e519f969ad40982e05fb36c74e7c35784fd7c3757d
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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