Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17bf0132e7dbff3…

MALICIOUS

PDF

211.6 KB Created: 2021-06-28 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 228aae54ce3d33cd4d11e62052d37f4f SHA-1: b1c64f5616c32450f0b811e3c2f1eaf2ec4d3286 SHA-256: b17bf0132e7dbff3699bb7eb2d7732e2ce6d310d611e9af99c16b758d51d8572
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a compromised WordPress upload directory, suggesting it's part of a phishing campaign. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan indicate a likely intent to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 5

  • 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.
  • 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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ab054df1---77714021069.pdf In PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/gagapukesofa.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/wulinotiwi.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/79681284941.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2nh54rtmhbnevlescsgdirebr9/32286838454.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kofupawonuvepumijib.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/87235007961.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd963adb53b---nowolirabifugezupun.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qmaeouvmim4muu978af2ih39oq/guweridanexibixerikoz.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m5v6eqgerh1em0b40v3oa6sd4q/kilixifagiw.pdfIn PDF document text
    • http://lyshiying.com/d/files/77929908793.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/webaxetaxezepi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8469e310d1---37179559986.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/jemunuxazoxukebugisewu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9aa86ff4f---70848210548.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/21ed39460ce41c7854b383f6434cae52/ketisujavuvo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc7fc59ca---86845065156.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd4d320ae---bezidiru.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/zutixosamirepunufefew.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/lemuloneruris.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/gm489e7s2o0j83t0l5a4sgjqc7/gixof.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/zokifipirimokesopomonur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nest+sentence+in+englishPDF 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_off0002d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1E0 21960 bytes
SHA-256: 36e159de9cf7c3bb0c85e220a5594ae1fb417338c50af8b7f2ad5836c41aedbf
font_02_sfnt_off000329d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329D4 10104 bytes
SHA-256: adb0b793dfb2dce992f867bcc238918e419aa98fe067fc75e1ab31021f5ba2e6