Malicious PDF — malware analysis report

Static analysis result for SHA-256 d092bccc7c783d82…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 06:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1327ab3ce17fd5e7bbd5ca7f1a5d65a4 SHA-1: 03702368cd49cd8ef51717b2adbf0c4a6d5cd20a SHA-256: d092bccc7c783d82f86017fab5eb7b0a4c768a1443ad043f8600a03d72eb028c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The primary function appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.findvoters.com/userfiles/file/linexipas.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115bd31e80d4---42512581571.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/14130359152.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/nijupokinevejurik.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/48925559822.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160779e8b14a94---ditazotarunodi.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/38673979940.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/38698588325.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161260d43d1062---pilajezibawifejikimizan.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed4856d0f---7196503467.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b4b2f21d38a2b5db9c3b8ec644700cba/99373950642.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c25c2610b---46390272239.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/98404571852.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/kakaxufubufaziwawisupira.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e32f637e5---reduxodujesejunefol.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/gosawojar.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/75682959389.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/64607329022.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072347fd93b7---zugezet.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/loruzupukokomotalerovog.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2adbc58b---83571419133.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/71774212219.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/24785332440.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade503a5d---zudagejesak.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/68710700770.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/18ak2t8updul145idfdcvdntff/pukegepoxurujivisaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=enlarge+pdf+file+size+in+kb+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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 10852 bytes
SHA-256: 60d509eb6372fec9a1dda5fe90e628f75e337da4b18868b602e6dede6c84d532
font_01_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 16060 bytes
SHA-256: 61dd383079fda2a5136cc36980fed127b24d964d946353d1334454fd330bd829
font_02_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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