Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d994d9e765fcb6…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 20:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcf4de1e5d1256cb4ff2871e16d2e10b SHA-1: 382ff65084342b6252ca5d0354fc19c036c54816 SHA-256: 54d994d9e765fcb68a79df3f04a96871e8557ced23e3a89d61f7c0b90cc6223b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://channelletterguide.com/ckfinder/userfiles/files/7082616901.pdf In PDF document text
    • https://sanruouvang.net/images/uploaded/file/vigokejajirirukir.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/65747148146.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/riroruxuxupagenopofu.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/satefudevugegaxanigovod.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/petomizuzu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49445639366.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8a4456857---xesejebe.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/37690871773.pdfIn PDF document text
    • https://porfic.com/fotos/file/mabek.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/dawubijexidomisipuwupimew.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/17138325762.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/pozosovasowozuguterutaz.pdfIn PDF document text
    • https://yasacompany.com/upload/files/relifiv.pdfIn PDF document text
    • http://strap.sk/uploads/files/rojuwuvatorale.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/susujopozorus.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b2ca53f1---10504368463.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea0381d84---97685373751.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908000359448830.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/6347257903.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/mixipuzotukenatorusi.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/31355688777.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/delopifuviboturowuxozuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=death+becomes+her+free+full+moviePDF 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_off0000bf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 17224 bytes
SHA-256: 47a79a3768bfcf67ec9c17186ff4c0c5efb079c2d4a14526af8e218edb739852
font_02_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 10804 bytes
SHA-256: b107240f22d284e0cba1158fcce9e9679471240a678fcf8dd372da128561dde2