Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c0e5b40a190b47…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 01:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94cfcf6c65721fa21033eb51a7c245b4 SHA-1: 1cf314540b32c72e2dff3419a6c09369fa427ca1 SHA-256: c4c0e5b40a190b4751590eb7de6abc730a6f876eea6b900e79b8dd21e1ea9cf4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the presence of a link farm pointing to compromised websites and disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ohcsi.com/ckfinder/userfiles/files/vakusitifuzijagoxakegafod.pdf In PDF document text
    • https://nnt52.ru/userfiles/file/vaxoziw.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/rukusifijovejujaregubu.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/sukabo.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/33090759438.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3cbphv7tgtehkmit6h9b7poga3/56274387358.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/540352839.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/10755255981.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/bipafag.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miwibuzutenoxorivanij.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/44153067485.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/diwarivewokalironorur.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/59737169264.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/xagosuzo.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/35797803978.pdfIn PDF document text
    • http://schubert-hh.de/image/file/24175901288.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/99704522943.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e14826117c4e089141663c645b42dd94/12274767379.pdfIn PDF document text
    • http://irths.com/upload_files/files/81245335481.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608002b569b80---55626404775.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/4333820702.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9887a536a2---sojiz.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/80669946009.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96f4efaa0---kutodawoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+lighting+in+hotels+pdfPDF 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 10592 bytes
SHA-256: 5e0f9aaef52fbe4019db400bf86aac7cddb16110c27446219058ba7bfe6179b6
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 16904 bytes
SHA-256: aa2167a51a3a5570ee724f4c8edb141c96531478132d22cfd18198686e7114f0

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