Malicious PDF — malware analysis report

Static analysis result for SHA-256 55397ea9f4e6bc38…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 18:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8077b47d13788ce09f9e45b14d0f53be SHA-1: 8337ed369218b86756b7c6cc5f728d548df0053f SHA-256: 55397ea9f4e6bc38378bcab6cc29155f25c373182fe820389709ba6ba9f6106b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to distribute further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1a79090b463d80e8afaf0048086066c1/94822972329.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160948a1f15c8a---pipopet.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/f78d7832389b26b727efed35b0d01869/xanamepofab.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sulopag.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086563d457a5---dagezefinised.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/10329354687.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0fde95d4b---wijan.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7f624d5ad41662d27a85b7ccc0996d9f/lolizojuzadumopib.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/20444064319.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vutufuwojawijap.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607422348fdab---43123201646.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/64919523196.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/basusipapopapagonemux.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bn8funbfutdprjkp29iedp01e9/vuzesu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59485d84d---38696387039.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/batuvibeniwukupovajivap.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/31929513053.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8707f51c80---70511333224.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/gifarukemukisimipudilaj.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nobuxuzinoxonifino.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hpvqs9d18uop2189bue9c81e57/jujegalup.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/63509256803.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/197375966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+main+difference+between+ionic+and+covalent+bondsPDF 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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 11028 bytes
SHA-256: 17c3d9ce6c82340def70b8e20c21b4abdab1b266d66ea96948245e566043c32e
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17008 bytes
SHA-256: f3a761f69513d078acf80779f8065c5f0ddd6d6a74f1ddb8d651614754d6f90a

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