Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba1c0bec19e1061…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 07:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5589f71fd4d3af10fdb5a2c269b2c29 SHA-1: b41c5ad6d95757b2590fb3a303d643d6345723bf SHA-256: aba1c0bec19e1061e1207b65c751499b963b0b3663d2ed05f8ffe08506e17d75
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple URLs suggest an attempt to drive traffic to malicious or compromised sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=convertir+un+pdf+en+ppt+en+ligne+gratuit PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632304be8d---zizomutelimuzemugipiw.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57d1029bc---tivokasama.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/senavebuzosomat.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/rimepitepanodol.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf63ece7d1---34447144388.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8d220a29ffdf0f555e895c125d705605/noxexase.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796549a1df2---pewivenasero.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b2d610cf90d42e0706b9f2edd1feccff/kuzorekobawuromewaba.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/94926593463.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e681979582---wivem.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/93902eec8f56ccc82883a94e6fe7fbed/turexaperiparigodefapat.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf2c85f52---21329591988.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/gikej.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/55956325332.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/78403653161.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f7107e65a88f8a8be105655c365984b6/jolipowo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761abe10587---34798653224.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/c93c6dc1d2b44777d28b6bb7a30b22ff/44793157670.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eeea0d1063ad6f366a50795c183287c1/sawivibinamazab.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162365851730.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/39864960347.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zivizodojogixujedosubev.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5937e3f4a---fememolutomepazibixu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/dozegunumelodabaj.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/nabelesarowonifunogefu.pdfIn PDF document text
    • 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_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 10700 bytes
SHA-256: a6bba1589a37ca85502d95bd00749cdab547f6a84be3564dacd9d1460b80b56b
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 20268 bytes
SHA-256: e000f3f5b95134f425ac220435487819850bfc01db4e430d1262b6be72502946

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