Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fdeec0eed7046e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfbd2cca21c54c82fe8b0ddb255c7933 SHA-1: 3ed7fd0d5f5876ba539c7ee50e9aa3356fb26d8a SHA-256: d5fdeec0eed7046e84569994124873ed84e5e9b4f725dbe5e23ddd83b96e4608
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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 http://icloudcleaners.com/uploads/account/autoresponderfiles/53504830847.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6edb90e8aed324eb3d7392210809f745/kaserupasotog.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/jamuxitiful.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/wekota.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/mesagujoxevus.pdfIn PDF document text
    • http://vkts.se/userfiles/file/88070173704.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/wozalugokovox.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/14715404918.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/setiwuminuvaxu.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/57074910793.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/2345034885.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/68623224064.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/39769613732.pdfIn PDF document text
    • https://web-idea.ro/app/webroot/files/userfiles/files/14913288677.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210918094145.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bc8d80358---58727362799.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142340a21f04---keviwepozigapajajevar.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/34689702231.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e470acfa33---22686996127.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b972224f2---gezukosomadiluma.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/64053792295.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/87511353888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+check+blocked+messages+on+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_off0000c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 17192 bytes
SHA-256: ff09207347f5efa17d44a09bd06c6875341b74533d978d8569dd184fcac89bc9
font_01_sfnt_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 11128 bytes
SHA-256: f3b9bfadb77560a614e0cbfd59fc8b89ef9e74881d48442022f16a307d124f0d
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1