Malicious PDF — malware analysis report

Static analysis result for SHA-256 83efc7fea0ff0c5f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 15:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3fdb17fc5b448ea6744a6a8acf9ef5c SHA-1: 7c048e11d011b4a353ede920d4990f4ca9a3286b SHA-256: 83efc7fea0ff0c5ff2fc5892dd34529b219eae80e3b4ee62554faccb34433c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to potentially compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e1e6badd---79791009506.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c386d2d3068---pofenokege.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c902d822e94167955e30988899cc1cf8/zuvewofadonalev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0laculjk1ivq56pdbja29cd36r/16934390146.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/komexanon.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/47255372817.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/41331123692.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843d9be5c3---96589707115.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5ad8ea9dd---refevanovamivudi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/voxawojitazuzabuda.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/21651136031.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tuxujuroxuvamujebemalum.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210529033852.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/94395733419.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9287dbb9b334ca33f0ed054f56de61ef/dezitixori.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be02bdb5c2b---wejetifotewepawidadag.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/7484918014.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/78482000856.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/xagejaxozun.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/viresunegofumi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c51ca053f1288f3c0349e2bfdfb6b75/sodixugepefaxijobi.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/55267140382.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/vadokus.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/vikusugepeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=liniertes+papier+mit+rand+druckvorlage+pdfPDF 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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 19108 bytes
SHA-256: 08b7b260342ae3c8c0894f330c31cd775e8785507e11d0d56ac195975e48a64b
font_01_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 11176 bytes
SHA-256: 8a50044164c2501e4add0009598e3f0854b428336aeb6e4c3c65e6994e1279b1
font_02_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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