Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a564c1bce56fbd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 03:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37553c4438e36e215fca222f6013a56b SHA-1: 1c3d128964ec7516c8b055b52bf14afa67650a49 SHA-256: 88a564c1bce56fbd053fa77746a437c51d7b22146d7ae3bcd4953b255245d22e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload storage, with multiple distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The document body was unreadable, but the presence of numerous URLs pointing to potentially malicious content supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d4640b88254---galemejujofusem.pdf In PDF document text
    • https://rrr71.ru/upload_picture/xavaleteteguwi.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/firiv.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad78ca37e---pojenogatejapivowudivavot.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160985c450dad2---8240475350.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zinuwowogigajijafefufat.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/giwutolifixul.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/nesaborolanuwodamufisafi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a8fa3c65---vibuzinadaxoxusurixedib.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/34403292333.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qenqrvjlj12g5r2hrh05tf6lq6/xuvufefofaradakuxi.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/xetefiwep.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e2872a8ee41628253a7a18638fbaa695/28526299171.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xabebotakamaluxazes.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/zawogis.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608620a211903---7408725259.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/22319582838.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/2949138279.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/virogatixesajezifiluso.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/74632329941.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/jasetupezalimed.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bef5bf5cd---nuxafotunadidatojudala.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607346cdb02f5---99308356876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=la+tour+eiffel+histoire+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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 10548 bytes
SHA-256: 35d0e163d84b497c63862a045a6a5f8a9fa3d9f1d9b40262151185e288ffa323
font_01_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 19496 bytes
SHA-256: 27c422b6a0aa57503d575b4c04d754cb83decdb3dc468e721182320ab5d7d4de
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1