Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c84212d8bc064b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-14 00:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06a366d83bc64a5073885ea11b085003 SHA-1: 7bf4284892c4741faa8fab47faec058c14aa4508 SHA-256: 33c84212d8bc064b7db35e60c459b43f8187103b4837ed0b2ae458a16318d765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the use of disposable hosting suggest an attempt to manipulate search engine rankings or direct users to potentially harmful content.

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 https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/bilamilugobaxusejasoxosa.pdf In PDF document text
    • http://www.520amis.com/upload/files/78682955770.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/muwepolir.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/junagixot.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/powonokogaw.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/8896940710.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/juvapironabosi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/oohh3fdvei3373b9om782ftsu2/pukifekurawof.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210905043349.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/wagiruduxagiziv.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/27b39f2701b7bd3e4b3accc0a41765e2/31656332927.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/femipejovenananuju.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/funobawexojopop.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/ferenaveze.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/livewedavikerowi.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/kakateninoziz.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/65563230938.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/detipa.pdfIn PDF document text
    • http://inistor.com/ufiles/files/43500939412.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/56860687065.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/85549870738.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/gaxuxabekasap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+enable+cookies+on+chrome+mobilePDF 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_off0000b2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D6 10804 bytes
SHA-256: 6bb9edf4b725307e1a502b9af82e5726898833ed26844a7dd0b0e1ef73640f9a
font_01_sfnt_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 15416 bytes
SHA-256: 84e634aa351b455d8ff50a44d7aae76f48f1b5d6bdbe4101705036f9b86b93a1
font_02_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1