Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1c2c8361892274…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1398088287ba1f514db9215854cb6ab SHA-1: 78835af76755ed353edd9f947e8fea62ac09dd58 SHA-256: dd1c2c83618922744df1737a52e9c0da531a00457e87bf96a9f77f6408a1f180
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external PDFs hosted on compromised websites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crosswaysrecruitment.com/userfiles/file/jazowini.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b9d382d5---30161042151.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/34675674491.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/03536281d69901a2dadbd08df6448f77/vuxikujitufidedixilenebib.pdfIn PDF document text
    • https://tsegypt.com/file/23259895686.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/90189180772.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/62332642731.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/7df758c451f7fe33508cdbca72e5ceb1/wejekededosajevon.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/69003656001.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/plc4i1vlj0n3n8h0s9ause573l/werudewadegaf.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/sibimirofuwi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ef2c0a63bb4c7ff6b3bac530f120b7a1/53628369962.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29795553f---13549400669.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070763c95a91---lizijuzojulop.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/9268893115.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/56035882182.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210629044653_wzuf6m.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v83c4e689k010hck2jsjqi29uj/40604079640.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3dca354df---pevududasiwimurigemisawi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/xegusobegixa.pdfIn PDF document text
    • http://z500.si/files/rulosax.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735119b5db4---joronobalozusoxa.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/kopibimutanujanovuralavut.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608141ed6b17c---29936014455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=a+p+french+vibrations+and+waves+pdfPDF 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_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 10944 bytes
SHA-256: 5571328065833d3e0f80f0af1ca11aa1b13533b2d8b2e6a29cd45ff703a16951
font_02_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 16528 bytes
SHA-256: 0dba8aa1cd18ecc37b852b22cea1790c6a174ab452bd64c4023fcc64dd1611ec

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