Malicious PDF — malware analysis report

Static analysis result for SHA-256 c156fd4fa29f802a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 07:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a50d4cc0edc8ab36a84b7d9080f0d886 SHA-1: d824de0befdaefa61208dc79cfc19263263ed636 SHA-256: c156fd4fa29f802a0df3a283403957efa1e50cf0f94b99fab36ca82aaeb87903
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, including one pointing to a raw IP address, and several links to compromised WordPress upload directories. These indicators suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=pokemon+prism+gbc+download PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613711174e229---94877195839.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/33539602980.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/68959453628.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likefolulul.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/pudizovatu.pdfPDF link annotation
    • http://sichera.eu/userfiles/files/kotod.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/88181565149.pdfIn PDF document text
    • http://jsdarvin.com/files/205747559.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9c25abe5027bc19ffbabfe572667d77c/vereneketuxadenuruj.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/39089712023.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/wutijobudogabo.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/sedaredu.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/wawomizeniraratukedef.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/09d9e11ecc4111d993e55c166b12620a/47615204527.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/82086475266.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/tidivefofadowozolesif.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/debafapiba.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/75089138737.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/60441858447.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/kusubewok.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/jawagupiwemixapedawifa.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/7707406755.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/lafozunibiregatikiliz.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/61848525582.pdfIn PDF document text
    • 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 11076 bytes
SHA-256: 366a02127339b42d08710b47ef39ff67e2d6dd8b8f37d0d73944003489d5ab39
font_02_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 17372 bytes
SHA-256: b14681ee03d6334b8a0d4d99dc7ac00a3064e310f66c3079b7f18329f3091fdd

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