Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70d7b8f86e308b7…

MALICIOUS

PDF

79.5 KB Created: 2021-08-21 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e9a8dcab06edc6fc3996c6ea470bc1e SHA-1: 44b6c45a349f84795afa35dd7dead78aaef093f8 SHA-256: c70d7b8f86e308b7988227f1d40f0de5941a8b46cee09fe4ccff4d5f068d2c64
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's purpose is to host numerous links on potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://creatinglifeoptions.com/userfiles/files/kemamonetej.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/eaa0c6af63814c18e63a82a4274d2afc/tekapolowifefumifaz.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/lopafikifonozinivusogexap.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/lenupumosakifagapog.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1ce3e7bb2---jefuzega.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3581705aa9---magegag.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/h4p946ivel5nbvgnnhd9v7ohk2/wagotesopamojezofasapib.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/botajatawanema.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/dizitedofasasoso.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/miziromuxiwi.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/aenjh9aqicd11k18uvpaali987/37554230030.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210608201337.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/91047104453.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f67f230bd---guvarusifomunajolo.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/74310732866.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2si6avdb0rct0ha3s05am6n3s5/vonokubagi.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/91850091875.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/93215220056.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/3440480758.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160f30ef26d6a8---47507084174.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/xitemibabonilopo.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bamitu.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/zezakobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=usmle+first+aid+step+3PDF 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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10612 bytes
SHA-256: 2848a8a501b1d8c7fbd3719d9bac649537e251f894bc4bd73a6c19a74f39d738
font_02_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16164 bytes
SHA-256: 31b583791e531f4a0ec6f954df0effaee6918c2c4056077346cd9c4b957e4f31

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