Malicious PDF — malware analysis report

Static analysis result for SHA-256 844470966ab08332…

MALICIOUS

PDF

503.2 KB Created: 2021-08-17 15:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2d2c5f74b393cf096127c1eef261b4c7 SHA-1: b246d0e8e8bbe74fb5b1699e4d79e92a6cbefad4 SHA-256: 844470966ab08332d6a62db3c0ae2c5cd3d5d6d9958b37225ab25bbad707d093
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically phishing. Although no scripts were extracted, the presence of numerous embedded URLs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6761

Heuristics 5

  • 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.
  • 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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7b91b36337540f90590e977cabd495db/54762941597.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d5678e7e56b98287ec9ee7fec00cebcf/41663442683.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/18c4f7b457728ccd395ee56bbd476b6d/wufejaban.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1be5726f11b3439a96ee402f3023934b/samumipisosizo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ec2e866c---zodesikusab.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/87173920089.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab09391e9---59954601348.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b967bdf7ce---lizefewolupe.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/7115802812.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107250105418894.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/risopafa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161012893b3e2d---91084223717.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/tejoxafifawogamu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160703fde82589---fefawexajasadelaji.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/tadukixoz.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/sibareve.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/goxarifipate.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe81bb6db2a---6532343447.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/voluj.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161100ed45163b---wipasinisi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/62977848131.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///mivituzoxoduweneramude.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/70087953881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=microeconomia+version+para+latinoamerica+novena+edicion+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_off000764e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x764E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00077cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CF9 20032 bytes
SHA-256: b7b29f9427e135a2e6f0dc856d597434315a80c8449b0c7edc8c57947679ce51
font_02_sfnt_off0007afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFD0 10840 bytes
SHA-256: 8764eaa3ac47bc8ddfff20823cfd60e015483e9a3064bab482c65e1f67d45a0a