Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a27f9d6b81801a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 00:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38809919b140cf2099fbd5efeaa5306d SHA-1: 33e79881a50d18c8a1b5b130dafd6bb209a5e881 SHA-256: 85a27f9d6b81801ac3816fb28fd2e30079961c5508014964625f38b7454564b4
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://www.prodomasa.com/ckfinder/userfiles/files/digunigoliposamesukekena.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161311a033de5d---38156164639.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/6676845625.pdfIn PDF document text
    • https://tch.lu/files/files/dufet.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fimoralovo.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43378879486.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318173d2efa---fovupo.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/baaaf7e9ad2372060da1f15edea577fc/65793502701.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kujadodewesuzonugel.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab5b5154---suzibinomev.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/kivomazip.pdfIn PDF document text
    • http://arucax.am/user_images/file/68951626131.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/leporulo.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/mupanikiwedorefabizewo.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sosavatifozijoligusuj.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/10030735999.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/87606718838.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/kupimadizovo.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/betot.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/16111774055.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/wijosewuzenodalumulixavu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/77acdb1fbd5c953652656647b63062f5/rideferep.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/70186364431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=definition+of+co+curricular+activities+by+different+authorsPDF 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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 10996 bytes
SHA-256: 519a83811be39bc1410eb44d665f1f6fba15992377924a149bd0bf8b4509b7f6
font_02_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 17332 bytes
SHA-256: f4372716129e096207c0e9fd4b11d8cceb7035ac7b948578c5561b4c6df288ed

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