Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2291195b2011ab…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 10:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 297bcb4c22b464e7be07b432ab227194 SHA-1: 058591ffbc366896de591d816a8d00d2639a806d SHA-256: ab2291195b2011abe3e41efcbcf79ad2ee7f77066e4f1aa287d86b163d00b327
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coumert.com/images/file/49333128612.pdf In PDF document text
    • http://selmanoglusigorta.com/userfiles/file/89381103107.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/lezaruritodumadavevarig.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/38185839823.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f5faff2ae1f5d053f77f6dbe4683a873/84617120832.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7432c7ab318c5013b73ed95d67f89c4d/vepofe.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nujenisaxo.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210910015740.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906205015.pdfIn PDF document text
    • http://technocom.pl/editor/file/zaxufokuzinujajawuxul.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-12-11-50-35.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/bolitinemapipipolafuloz.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22624965151.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/natulikixumujisod.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/96416575405.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/kajokabezi.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90cd4ee4a---wubow.pdfIn PDF document text
    • http://gr-chem.com/upload/files/93622088546.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614196ebcc5dc---5426045298.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzezemaxorefir.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/bokipe.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/rirunigamapewadoj.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/tavevudivox.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/sumuwababuxulope.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/70900046696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=instagram+pics+viewer+onlinePDF 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_off0000c231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 23148 bytes
SHA-256: fa5dfd617cf332546214508ac5a89d15039728f00732eeaa2c1324315bf7a66f
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 10820 bytes
SHA-256: 5b1b13e4bb567cf5714a03a2c2390c5ed485234f7e061368a355d3e0640a5694