Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f75be78959d496…

MALICIOUS

PDF

84.2 KB Created: 2021-08-21 03:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 223809eda2266005929b1edcbde74662 SHA-1: 293f451c7f9f1e91e03bc78e41d3c1a59e379f92 SHA-256: b7f75be78959d496a85b1db56ecb870d16f73603da9a6f1fc6f032782742ec72
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering further payloads via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088716157d8a---lomefowiwogesikutepopu.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6s6u5chb5gjjnajnmmlv32t6k0/xeponugegubeja.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/su3hhkkk24u6angru3258t4ap3/zutujokuzixakozujebe.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/pekamepuronidusujamanewu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/182a594d057d55909994fbb7b4f4ecdd/68054771737.pdfIn PDF document text
    • http://patroha.hu/file/80280701858.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/r5tg4g28g9gqi2t533e429fg02/52679344467.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210820_054334.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23041759b3---kalaluvopebo.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/ronozaxoxuxosogesot.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/38733416231.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8dc2781e---6281605915.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/nabagatezukif.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/44745826222.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/xuxuverogisudojumelixuxil.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-8/20210508143820113197.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/62605786814.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/9567283183.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/07ecb8d7ccdb8a4e4b6d537b48cfebef/5722793393.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tokebelili.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3970355943---83054568389.pdfIn PDF document text
    • http://rjt1.org/upload/files/760283609.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8862826bfecb04ed4ac3e2d7afd9da6c/moxugobelejiwidokedine.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/677cf9e0c05ca102819c75367e0b8f56/pikevebitalab.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beaaac766b5---dawekazewuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=con+la+bronchite+asmatica+si+pu%C3%B2+fumarePDF 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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 11156 bytes
SHA-256: 80b214062f99a9aaf4deca57bafd8a7a6ea07dbbd6fbf6f02c19d69bbc0919ac
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 17356 bytes
SHA-256: f277bc0fca398e413aff882aa2f90a001198bf35d40cc7ed159df21faeedceb9