Malicious PDF — malware analysis report

Static analysis result for SHA-256 8887bbc13a12cfd1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 07:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 673ccc436b3313ff84d131e153ee6e35 SHA-1: 255727d7155cc865dde50ac06434c889b9d36675 SHA-256: 8887bbc13a12cfd1a83f20732c4efe9ed2d2e9489cde42dd2fd97e7fdb2c1324
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external PDF files, many hosted on compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. This is a common social engineering tactic to facilitate malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tantos.jp/js/upload/files/kinuzefanulira.pdf In PDF document text
    • http://cariboohose.com/userfiles/file/zatadeba.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/88235401477.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090702573871.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/42442637482.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4fdc7ca9d45f72a3866fe3ee4ad57f7f/37630830514.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137459346e3f---37880169602.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3d4d7b1e---wikefegirowewili.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109130220272823.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/rebapamagusowudivusifo.pdfIn PDF document text
    • http://palami.by/images/file/rawuwipinazatipeses.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/jodofivitasigeduwuvi.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/xotufesemaz.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/supujevivazi.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/27879922211.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/janipeduvevibekus.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/xezumepejum.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/kexekipifotolurafogalerat.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/44477210500.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/eqrdhatdd74h7cdhl6tejh89c6/lidime.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/65111242469.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/vogikekesufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+fast+save+apkPDF 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_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 10544 bytes
SHA-256: 9c786cb1b55c514311b1cc46d261c55f5c109cde13bf59a777cc49173c0140e0
font_01_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 18428 bytes
SHA-256: 1ff3e5d737e3e307c4c2ca470c536cb876781952080d8451b424ef67b26d7599

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