Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccc4b8d8717c7e1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 09:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a2671fe07ed8908f7f059e355583616 SHA-1: 0d92e953789d1c283e2189e789120a859f720078 SHA-256: fccc4b8d8717c7e1ac1dfbeb507ba02b8e904d17a4fd9ec2c72e35d5709ce6cd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zlato-invest.cz/upload/files/34627435101.pdf In PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/linukabosonebopowixugeruz.pdfIn PDF document text
    • http://renknh.com/ckupload/files/vazuzesupesosuxabatij.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/41369822247.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/tosunesizuwijumala.pdfIn PDF document text
    • https://aromamarketing.md/img/files/70836474586.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/kesidewadadosexegorof.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/sogusi.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/lowiwaruzikewexizo.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/2827858598.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210907_7CAC19979E8E3780.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7b1f1bf89a997e22da4eb64e47d09321/mebavimitodokulis.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/daxovoxilobinozakes.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/geravukizoniza.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/25603279988.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/69107873795.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/pudotabi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b1847e65---melarupuvavidefaremi.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/41583465621.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/99517865271.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/lupujuzopazalip.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/43864316233.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb21b2494c---73753768101.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/supotikepam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=where+did+my+pictures+go+on+my+androidPDF 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 11120 bytes
SHA-256: 71071f4f4bfa0c0217abef1adcb18a3507a8305d0904163bec444a057941a66c
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 17340 bytes
SHA-256: ee3ac1ca73148c60bf4581cc45d513154c858197ac205014dc0678a873280d1d
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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