Malicious PDF — malware analysis report

Static analysis result for SHA-256 f290a91fcc8c09ec…

MALICIOUS

PDF

95.8 KB Created: 2021-07-14 02:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c370e067acc687b5c6c7e50f91fe42cd SHA-1: 8e78533a7e5e7e20a5e62e41cc5c1ba3e3812a8a SHA-256: f290a91fcc8c09ec2cecb2aad797418ef4f98b7d2414b291e74a2b7f5576f94f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for phishing content or further malware. No scripts were extracted from this sample, but the presence of many external URIs suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=summary+of+the+book+of+galatians+pdf PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7466bcaf5cf57eafcd0d514806bc9d0e/vazenugixotuxob.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/89739302201.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/93834582206.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/55d47b4e02522f3ecfd3ef8d53449060/sajowid.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///72577494221.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/sigafusewitin.pdfIn PDF document text
    • http://whatdwellswithin.com/file/mozewevagegegu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873866b266a---mupisu.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/6272360962.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160e484d829b71---76333828089.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/v82624j969081c96m0op7mbsf7/54039114980.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/lokoj.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/nikoxixasogon.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d3c4f07b4b6d378a16edacd66ae2043/2402811084.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/k3njq79amebunnn9ld620dpa1j/25389212180.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160911c09d31fc---bajuzare.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/55831173517.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/35449210276.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/5298939676.pdfIn PDF document text
    • http://www.puhito.hu/uploads/dunukesimewun.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d864c6712a---16441857785.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dibotedemuxudokevot.pdfIn PDF document text
    • http://cwesp.biz/upload/file/vebopedasakipi.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/32d0bebba40b9d2e6eebc4e1054c9131/mizitazew.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4812e7e3---58000899101.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_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 11468 bytes
SHA-256: f17ea1fd46d0f697f78ac9c18d801016ec632d76901d05fb62dc77cfa2c5873d
font_01_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A5 17224 bytes
SHA-256: 1ff172b9e7a983eff119a67047913faf5d59b4382ddeb265155e9d4842fa15d5

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