Malicious PDF — malware analysis report

Static analysis result for SHA-256 97451ec0d7f65ba8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 05:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 911174ee6908358923ed39aea4c2303b SHA-1: 823fc0a80a872189f83c76e4d6a8e9c7706659a4 SHA-256: 97451ec0d7f65ba8ee120d501f7b88cec9e9013315d8529934f328ca928b1415
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, hosting numerous links on compromised CMS upload directories, likely to trick users into downloading a payload. The presence of a 'download button' lure further supports this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5c6d00cd7---sofemujidowudadojonexulib.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607718d1ed6af---84577794986.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/dca7bd82163dd6599940fb01e127baa3/votugukokulofipupirizox.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/banafajegiwufozegulozopot.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ae5ee94b0793411ecaba683bb42b11fb/sizatunudamixiwu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f44e0573---ninifekojilegegerej.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c68c9a06991b84d9f54fbfb206a217df/lumaduwipod.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/01659b8bad4325288c6755ce1898d365/pubidorekorupagoraxefur.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/4654901286.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/21723923112.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/50086737613.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb5757b48---74209852969.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2483525303---98776241710.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sbic2kmqgcs316f2foeicef0a3/nexekidubagedimev.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a0b23889f488a8123a9a04f7e2ddb5e8/setenidutewis.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f94ec501aed3554dfbcd73c6eb5240dd/kobow.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/120289922.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vadix.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/mofidegukijo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14778ba35---rifudabizitarijuki.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/voduwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sodium+starch+glycolate+solubilityPDF 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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 19352 bytes
SHA-256: d33d1e6dd82e66a3fc758a8dd2506f9ab2e3ea18775ed4f5773324f5ce41f651
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 11140 bytes
SHA-256: 2817ec8552e2a4a439d97c1d152b028d8456e1bccf837d20be336815d2127806

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