Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d7750799e28100…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 08:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3473bbc6226aa37ba65340325e3e9983 SHA-1: 4fd384527bc5a1107cd076512be1eab138cc3b9c SHA-256: b4d7750799e2810073091c23712ed8e3c615bef6c98723eaffa353bae5b0ea0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution scheme, likely aiming to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://infrive.ru/uplcv?utm_term=best+games+for+android+free+offline PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161404a653e352---wused.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/zesavazutusaxomur.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/11676091255.pdfIn PDF document text
    • https://videoeffect.ir/data/file/joxagibilokaxawipovawi.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/60919767903.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/dixuzog.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wulalupotonafuwomovap.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jimika.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/62904469809.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/ximesewevunoguxewonuruse.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/37049228279.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/47499116529.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a72fcb1a8032466a2f66102d786cb6cf/61752118691.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/5551871140.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c50bbee58---56278917351.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/90614325560.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed78621e2a---jivotirafixuwene.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/18452902271.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/54377442227.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/wijiv.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tuxul.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/16679573211.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/74703472694.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/9253944479.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/86681596893.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/wibubuvasiwo.pdfIn PDF document text
    • 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_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 10752 bytes
SHA-256: 5a137349e77804714b64a9c2fb377e8ec146536dd4499b707b57b5d172c0aefb
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 17000 bytes
SHA-256: 3e0ac530ece16343f8f923a31bc41b4c165541576b9e370663da2f4bc7415c33

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