Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50eb5a1592e96fe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 18:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37535331fd897a105bba13d5da740ff1 SHA-1: d655e70c8a01eec115013449813c7845c6c165e8 SHA-256: c50eb5a1592e96fe602d67520c3c136a506fe98062c03cd3b8bb210a4f6e71b6
176 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. Heuristics indicate it contains a link farm pointing to compromised websites and a callback phishing lure, suggesting an attempt to trick users into contacting a malicious entity. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lmbri.com/WYSIWYGImage/file/keviwosawak.pdf In PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/zizovapakabeweruxor.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/wusupijativerupekijogat.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210912094854829.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/62907982899.pdfIn PDF document text
    • http://gibisch.com/files/files/24921486621.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/72008561051.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/neguveniwubukavasituza.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/kuxowulimeg.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/418ee5f645e83733c69487b74112b8de/gipekawasasit.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/13101694769.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/siziwobixu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/61426035683.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/819c8a0388c2f967c8242520dc33f496/jabajokuwizafuwavivudow.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109221624562962.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021917058552025.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/bosolapawujufe.pdfIn PDF document text
    • http://cssh.es/img/file/texipiwigurubexed.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/japulagolunuvorakitoxozux.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4a98fbad88b26292300e859ad9102e12/tugefuwaziwawitinek.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/wudivusujuro.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/zepivugirinegalap.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/36887179510.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pifemekajekutuxujoxo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/dojor.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142da547ea85---vowamosumij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=yacine+tv+live+football+onlinePDF 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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 10252 bytes
SHA-256: c7f8bbe5f95fd5a6de9360d1ee4d4d1f06a776b6ecada8eac39724e98cd01d27
font_01_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 18720 bytes
SHA-256: 795314e5d6ab22b572db404b6a2f8183c1c659e5d49721a4b8d3e2001ef7a0e4

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