Malicious PDF — malware analysis report

Static analysis result for SHA-256 1885f4b5cc99d14d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 15:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a7d9ed1539337298740c70f56d68cf1 SHA-1: 9c949ef7a1bae5044b152449e49428f604d278ae SHA-256: 1885f4b5cc99d14dcd4e83f307475a02e5c1f0d2892fff5c8125415e3e04f736
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The numerous external URLs, many pointing to compromised WordPress upload directories, suggest a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature, likely used as a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc887e47fc---vijus.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f076adbf8a0---bopefusu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/91494582741.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813dac60d6d---29788701378.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/61885914842.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/xarigatomofevepibalajuf.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/44316586964.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160abfca67b8e3---18346410818.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/91912192388.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/xomojekemuzebazepam.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gugexuxedejabuvomired.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc70d77bfe---82535668035.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/93143156740.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97235392733.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/57629001744.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00b19bf25---2421559395.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/nafinipaxurute.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/fenazelomesevewirujoxeboj.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f50c4275b88---65020925243.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/xedasuzimikebenotoxad.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/jilaberuwiveliwifaraku.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/33680343953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=codigo+penal+de+nuevo+leon+2019+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_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10964 bytes
SHA-256: c0787b4dda7e9a0d628351a713beeb404a4918451e0bb5a5059d038dee84b461
font_02_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 19460 bytes
SHA-256: cea3a69b13bdff1094b6778f018808cf527f7b6d9b7b895c78ffe5d1968134b8

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