Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd665b8d55f1832…

MALICIOUS

PDF

94.5 KB Created: 2021-09-01 20:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4daa9446a1319e1d2ecf872869a5d0a4 SHA-1: 6752679e0c66097eed054d37770aa53815cffd63 SHA-256: fcd665b8d55f1832acd548235f79ec6e032548e5d79370aa88ac6837dbdd1dc9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns align with common tactics for distributing malicious content via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://fl-forever.com/upfiles/editor/files/88000037564.pdf In PDF document text
    • http://saiprogetti.net/userfiles/files/kuraka.pdfIn PDF document text
    • http://donghotam.com/luutru/files/bodowesuz.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/22753444662.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/59319576726.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/83933826613.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/defix.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9a926096---godele.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/nutogeturolux.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/gesunaduvitapud.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/50678379112.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f14a10e50---zepavifivisewojitit.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd00ae8f4cd---wumufumukefedofagavupira.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/181280788.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c663b6123bb---kezasilovug.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108022018049209.pdfIn PDF document text
    • http://lawngo.net/fckfiles/gipevugotew.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/95147673330.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/tusuzaxeruzawexikikegu.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/65101862249.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3602d9e7b---pegaw.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nrfd43vosr35rteikjf6fb6rt9/38996105893.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/22ke69bonhofa3dkvs0aggbnn5/65833606419.pdfIn PDF document text
    • http://ezibra.pl/upload//file/vixibam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dollars+to+guildersPDF 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_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 17852 bytes
SHA-256: 1a70d34218ec552aa962f8cadf52d69737bc68f05efd807c5ad3ec02da3a97d0
font_01_sfnt_off00013ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BE 10420 bytes
SHA-256: 2ac76bfd87536317a78052d3106bca5d85994da163f6b40d1591b05705d9bc63