Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa6efdb9b644df3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 08:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d79c050745efd22f53f5e694f45fc83 SHA-1: 4029c6548e9de75592bf0d85a384fcf9e69d247d SHA-256: 0fa6efdb9b644df3150274c73349c3e0a5e03dc17fab0dee6bd99ca42f9177c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=design+thinking+creative+problem+solving PDF link annotation
    • http://alde-pace.org/ckfinder/userfiles/files/20528050796.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vamawujamogumose.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf1818cef5---97689235181.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mi44cagi94m5krbsp70sj4o4nh/fodisobepivufinarodoke.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/828ce588953f5518eb4165a745a8e1fc/895453210.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/60547362366.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071f66e1d1de---46420921518.pdfIn PDF document text
    • http://dytac.hk/userfiles/48309924028.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/24656314890.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/48744059386.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a528a057---19375036946.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/volesasef.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e28070105---79129441195.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/80485953220.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/37358050157.pdfIn PDF document text
    • http://slsnn.ru/content/file/ramidibiwegev.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/77516793806.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/46618259294.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/tawumoroxamuxenobipuwamuk.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085510dcf542---buzenuwez.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/toxadobozepagirotaf.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/15120174380.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df090052f9---kodoveturoxazerir.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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 11120 bytes
SHA-256: bb136956bf831abc0e97d1ba82c00ef8aec39adb5c6a7e244d3c726c446aade4
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 17688 bytes
SHA-256: 84c78d3b98de1cb42fa79d12f5bfbbeab0d06d8720c5925ea86b0415edf05754

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