Malicious PDF — malware analysis report

Static analysis result for SHA-256 82da371a6779ab83…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 18:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: aed575e3ccd735e50fc9222ee52eae1a SHA-1: 7406cf41a10356baa7c8be2ba32757a1444a30b5 SHA-256: 82da371a6779ab83e4555679428aa0023ddf60151bc819bd976bb5a5b513ced3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sanruouvang.net/images/uploaded/file/rokur.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/24442440769.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xutadufixerube.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/luzakefivowozupanuvikojo.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nawapijujobugegok.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/75074628394.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a42d9fb1---74693358186.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12d201657---48255358118.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/92159052948.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/64102002731.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/mozuzarakafuxezoboxakopa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16127116642bfe---wurilufegekanetirekix.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/gikimumudubopa.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/64861134827.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jufafovutobevebetemozoxuw.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c64380e1b33---53210971356.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021083112363743.pdfIn PDF document text
    • http://derma-dts.de/files/file/72283344836.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/30123948264.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xetomuxutupanubumepiv.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aadbacec5---86929052111.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/nodozaxagofadidamufezux.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/jigiwabotami.pdfIn PDF document text
    • http://landpas.pl/upload/file/tozob.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e3054ff2---84692900832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=scert+9+physics+textbook+solutionsPDF 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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 17104 bytes
SHA-256: 16d6ec60c5e82cbe4685f6fbd1f4672c82ad90d0aa210c0ff4a6e4c101c25736
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 11100 bytes
SHA-256: 733c7bd8ed0711da2502cbdc7902ccf9b2954748baf951eed367da45faca94d8

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