Malicious PDF — malware analysis report

Static analysis result for SHA-256 1722f76be164708b…

MALICIOUS

PDF

107.4 KB Created: 2021-07-26 03:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb23265e67f6d44136bd67fbdd5a0d41 SHA-1: 219e40c2f28e5d5d378133e68ef1663bad72c0ea SHA-256: 1722f76be164708bde1d3bbf7c83934da325aed75b60bd120c1546973d29afc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://kondicionery-vidnoe.ru/upload_picture/file/zugixa.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1882446fe---86929779798.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b52d0caa9423b77ba08a55e480fbc815/konatuxusosuzozezov.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210606115613.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c380eba3fb4---8818817644.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/r0rkacnuf6f0g1855jtf6ngrtc/10524839051.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lixewopovesebanowu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/29885116.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/10303048741.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tumul.pdfIn PDF document text
    • https://anfauglir.com/images/file/71045778865.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/dorubunuvi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/s6akreab35n2imbn92tlb0g6i0/32253163070.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/kevepofixolikoduxajerewo.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/saguzotugovuwigazetero.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160900e6bf2a65---luwelatotoburufinugibimo.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/89770672906.pdfIn PDF document text
    • http://pendekaremas.com/contents//files/29314844632.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160729256748a4---55749158571.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/bewis.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/biwuvinugomox.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/730b93f6ef94888c3c36b9c83895352f/zukes.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce3500437---86552627855.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a898b9464---vorugabaxiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=altivar+320+manual+portugues+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_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 23800 bytes
SHA-256: 8050c09b3ee6fbe872cca9405169717410b3c57ee534d459e25d7e9700bf77df
font_01_sfnt_off00016a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18262 11404 bytes
SHA-256: 24e10d3352a19a21ad55bc7225467fea382ac07666f5431c13562a5b8d1edcf3