Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5fed193e1d8a73…

MALICIOUS

PDF

80.2 KB Created: 2021-08-19 05:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7a4c68e05352826e9c189d78b4cae62 SHA-1: faa242a94a9cca6d4df9048e6b52bd055cbeeba9 SHA-256: bf5fed193e1d8a73f560ec16cd11eb1930f75b2fc2ac189f8dac39e5e8f2740e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a high ML score supports the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://soudurelauziere.ca/upload/editor/file/93830529496.pdf In PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1947db92a4b944faa869b505531e2380/79499307905.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/fafojakamagetufulop.pdfIn PDF document text
    • http://nova-auto.com/upload/37151035853.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/baeebbd6ff391d7c4860c2cb5d67b534/85175365123.pdfIn PDF document text
    • http://ranagro.com/files/fadejof.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b28b5ec31ccf4c169234ec26cdfb41a8/19105966666.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/26753136163.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/62053502865.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/65868592027.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30baab1c---11563900523.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/newirofinadupego.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/cdlg4bl2brj5bbtlqd7t6u37qg/kujogaxozasotupadene.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3448118d181ceab02744321bbe23134b/99357065019.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838af50b87e---pavobewedovovure.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/087aa3b32224a1c7bd2ced153d261788/75193681800.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fed30b2f---digotojuvasa.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fbf2eb374---46880271033.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d384092f021---jilimudo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/af53a4ff968bd36dd44cfc0a86a061f5/60316340698.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/11008808930.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/wefosumufowabujanidik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+pass+lionbridge+rater+examPDF link annotation
    • 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 11052 bytes
SHA-256: 63d997af51840f5e0fb9213b1ad7003458bdd5121f47e587cb882893be4c4cd5
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 17228 bytes
SHA-256: cc8738f3328a5bd6e4d1ee136c1e37dec27a70dea9538eccee45589e7cc210d4