Malicious PDF — malware analysis report

Static analysis result for SHA-256 d386c550fe65833d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 11:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30edbf9b5bad2bd21a384ce54f0b1160 SHA-1: 0062bd36699b3583c814653a42b3ec6aa037fce1 SHA-256: d386c550fe65833d67968d543ee073acc4fe9a5836c8f1c38123060a44edd488
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5831b2c1e4---tijebilofozusuboti.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4d15a744---vasidaxekido.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/20974710414.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/97365946438.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/xiwisitukinidukedupawowaw.pdfIn PDF document text
    • http://balone.net/_upload/file///luwegomixosipev.pdfIn PDF document text
    • http://garderoba.sk/images/_file/88908359236.pdfIn PDF document text
    • http://seamacros.com/upload/file/1502206233.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/wazokazurigo.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/49593600105.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v6j81g9amth8aar8315cbnh74u/55297825023.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/78491677906.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e83d1d7fd92e3cefe67bc5357724119a/30415408.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/56970553226.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/41360021108.pdfIn PDF document text
    • https://medtek.vn/storage/file/75466340976.pdfIn PDF document text
    • http://remobudostol.pl/pliki/88637781663.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/29835b51bf76fd6fe508d519a21c8cf8/92648211719.pdfIn PDF document text
    • http://unityproductions.com/upload/files/96680382080.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/kixaziwasejefibedobaduzu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/28282045872.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0v01gm34anq3uj9hbvfephu4o8/22644745264.pdfIn PDF document text
    • http://imi.vc/upload/files/gilemadejo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f18a331d9f3---64083051751.pdfIn PDF document text
    • http://klinok-saintp.ru/files/zixeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=echographie+doppler+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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 10512 bytes
SHA-256: e414afab31c0a63b13d3bae30a8f072c08e36ba1e488d775b589e23618dfc381
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 19796 bytes
SHA-256: a6ed68a627a71eedc4eea089722d441ad68dde9398f141b3beb9726fcd9eecbd

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