Malicious PDF — malware analysis report

Static analysis result for SHA-256 32887ff8ab3df4ee…

MALICIOUS

PDF

89.8 KB Created: 2021-09-16 15:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c32750c32d16aace61bd9733d0564bf3 SHA-1: 8cd64173899989935b6db19014619be92e925a27 SHA-256: 32887ff8ab3df4ee2ebc8ddb055589c4aaa4219c1d321dbd2a860d17ae27d315
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://krisoc.ru/uplcv?utm_term=nba+2k20+obb+file+download+for+android PDF link annotation
    • http://giadinhmedia.com/uploads/files/sugex.pdfIn PDF document text
    • https://penzion-palice.cz/content/13564383246.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p4o8eb9fq1dehekslams60kopm/10576531588.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/27115165095.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/lodojatulafadago.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/7580994438.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d4qi3s6og1b20jspd2a5ntjomb/bawiteb.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/bufasozalerejimezakox.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/vepen.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/vojanogolipasap.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69582864219.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/3163186738.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429d79a7d9d---61359709548.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/68631375697.pdfIn PDF document text
    • http://holzbau-napetschnig.at/vubivolotamo.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/99653774684.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/96200187299.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/senuneboxosizorefina.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/norapapuluvofisilutode.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/90104133231.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe2cf2e85---97625575616.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gotojod.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fexomipa.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab333cfd8---51139824351.pdfIn PDF document text
    • 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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10616 bytes
SHA-256: 22bcf9e1ddf1217dffde1dd379a8e13b6c60441213a69f4f9d58cd12408210ff
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 18144 bytes
SHA-256: 8447e61e040661c5d008f0acef3d8aba6c0ec95a53539e15362f3ff6126c2dbe

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