Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bc94e69792f464…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 21:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 77523060c54bd164af9c9e71072a0e75 SHA-1: 967047a09374280604fd421d2dc204a8261a0e32 SHA-256: e1bc94e69792f4645dec76701d72cfff582ce474db5ec4392cbda419c402d3be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to link farms, some hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • 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 https://redac.ch/upload/sogijuv.pdf In PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/girujikaxusonelilumenid.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/57923116077.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/tofuxofaruzebagomeruwudud.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/sogutibala.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/nezapinevalabad.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/17948073433.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/82343892323.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb24bc1601---seretasopa.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/warodatupipazuvi.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jaful.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/64216717609.pdfIn PDF document text
    • http://bankerz.in/qpic/files/70029151766.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jofalobu.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zomilugen.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/mumazepazopobajotazujaw.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/75289969163.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/03cb90974adbe42ae5b1ca9751fcfc42/mogusadiru.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174b1607a8---ximojubedumumilevalekil.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/48021614959.pdfIn PDF document text
    • http://ranch.pl/files/file/5294332117.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb3646351---vitabiporogef.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/defoju.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kuvilevur.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/leliwijexil.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/rupuxepodutuzuwejojujig.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/bozotudadimusasajelitixub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=magical+beauty+plus+cameraPDF 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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 17200 bytes
SHA-256: d524f319c28d4945b6dd64ae39ae908384a8623bad00f2fe25d3d807b8880849
font_02_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 10840 bytes
SHA-256: 5bbccb147b37b6f5982d4414165aa7af7b0360cce47a9b0c27feb577b5dabe46