Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d753ec89e345e6…

MALICIOUS

PDF

67.9 KB Created: 2021-10-02 14:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa85e211ef5ce6e1e187a2cda33b4c64 SHA-1: 81fd52b8765e3a2d5d0f52d931a109a56aacf2e7 SHA-256: 48d753ec89e345e63dca51fca45a40571de2aca8d568906ea389c72d0ed58552
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common phishing tactic, to entice users to click on external links. Multiple heuristics indicate the PDF is a link farm hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://philabc.ru/uplcv?utm_term=wine+used+for+sangria PDF link annotation
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/nilasesimejototarokijuv.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/62210006164.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/22321543000.pdfIn PDF document text
    • https://iohrp.org/f_files/files/12159601274.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/21428109575.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/jamosoxefimukopuge.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/vebomikolabe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615808ae63007---43254423747.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/lejimexexo.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/99025547860.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/14744501769.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/48086411906.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0a07db2812f4456a37ad0245dcd97b3f/pesulizifegofon.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/16548219515.pdfIn PDF document text
    • https://ismart99.net/upload/files/75744457587.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wipizametapek.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/62884241231.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210924075506.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/zulikatidubizopubagupame.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/velupolujipugagi.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/misiviwa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161344991635c9---mebodegofanoritof.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/13484311325.pdfIn PDF document text
    • https://led7.ru/file/34654532730.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_off0000ae65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE65 10480 bytes
SHA-256: 47ce4c0698531046b948500e16a34fc17823ab2a7cd10658956731461511b8a9
font_01_sfnt_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 14456 bytes
SHA-256: fc49924ffeedcf1726e977d1b7d6a947ebd65eb3e701c45bf4b7caaa6912bf0e
font_02_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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