Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3e6ec7cb0850dc…

MALICIOUS

PDF

85.7 KB Created: 2021-07-16 17:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 780e59fcd475f627b4e4a8ae01a77c50 SHA-1: 23d6d1ea9679ad673003164dedc66c8b0d4baf54 SHA-256: 4e3e6ec7cb0850dcc87354fff230879740e4ef3cc5caa63bf2d4e3f8db499ced
164 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, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests an attempt to redirect users to malicious content. The primary attack vector is likely spearphishing, with the PDF serving as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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.
  • 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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608068b3c2464---60836321259.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ff34e48c35572f78e834b17197bfc54e/89242176487.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/vipomatatewunufazutinike.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7rm360qvjcn4isr8adbkq6en27/waxepigewaxaki.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xetokusopisupikuvit.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/81294224782.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/vifexuxojol.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/cef588a12b0ab84d291a40c571adfcfa/31483114771.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1cd4317---jewigofufuxewomizeraf.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/955566e9231f84640f698e74bd2cddec/bofumuwovovozemiru.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160963ab298b79---57976298379.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/xotisifusima.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/91913263576.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c20232995c5---39083863237.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/ravozasetiwagenopa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145bc39c28---51819683826.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/2m3rioif0kttjvv8il16ei0rd8/12380046583.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/goq940s4je4427cr5s44i641ou/rezuwimapomofadelas.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d993697d374---kigubo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bumigobovujelefibefimamew.pdfIn PDF document text
    • http://www.toptehnik.si/images/2669966452.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b15fcb8ab35730499714d4ecdffc74fc/gakakotodomanudetepugiziv.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/80282910120.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/61956947031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=climacteric+fruit+meaningPDF 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_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 16620 bytes
SHA-256: 0e6b6d1b63e4d23745d9e2dfc44e2d456e30074896fcf4c85071e0936a63160a
font_01_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 10520 bytes
SHA-256: 79ddbebf5930b47c337cff454b6ada0b8fd52df8422c87e90121b70b715c5e9c
font_02_sfnt_off00013164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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