Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd44cc77550a7f60…

MALICIOUS

PDF

71.1 KB Created: 2021-10-04 00:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea3121357920712772a34b90e737a7ae SHA-1: 4f7f1b33c6bf812b78f11e72fbe8b63ef2ef4d6d SHA-256: fd44cc77550a7f6031130f1b59b9200eb561bf5d22f2da7e644ec15e9fe55e6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and other unknown hosts, suggesting it's used to distribute further malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d524b727ba---zilivipevagerivudifudet.pdf In PDF document text
    • http://ambvetfanini.eu/userfiles/files/46463068798.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/262816425.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/91772891863.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/17750563842.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/386c7a8eeb9f2bf9fe78b5ee57b0863e/sofutetefibafisuwege.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/parelo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b41a8ab15---83505214163.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eb69a391701f5b4de70f6df989597c6f/wazakigakagigum.pdfIn PDF document text
    • https://eurotig.ro/file/sumodotip.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/61467602596.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/beseta.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/41745473583.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vopinaf.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/86024326777.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/89160559851.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bevademot.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/31798277883.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead83ba9c5---votofoze.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/51935492873.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/24021620961.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909145159_148584115.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/32276130139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+long+does+it+take+for+law+schoolPDF 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_off0000b191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 16516 bytes
SHA-256: edb8d97ef6bf9420bd85d429964029cfa77e37a9e51fec0d5e5f94fa08e2153f
font_01_sfnt_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 10924 bytes
SHA-256: 3bb028bd02356fc8d3395d4975cac47ac2bead43b2b5ce19c9ffc8e20e77479b
font_02_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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