Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a0168d29889ab…

MALICIOUS

PDF

95.2 KB Created: 2021-07-06 19:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ce1dfd6097616b958ecb10d8af7f7e4 SHA-1: a5cb6f87e6b3902d06d0699798d14b44e5cc64fc SHA-256: 4a0a0168d29889aba9e22bb9da1466248d92dcd4bfa0c43bd2aad2f052066f54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on compromised WordPress sites and disposable domains, suggesting it is part of a phishing campaign. The embedded JavaScript likely facilitates the download and execution of a secondary payload, as indicated by the 'PDF_JS' heuristic and the 'ML_NYX_PDF_MALICIOUS' flag. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=one+thousand+nine+hundred+forty PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160894b1c886cb---61334276167.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/87212313740.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/dutulalavizujipubesizizi.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/pubajewedubogepa.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/effc211e1e16a75d9d4b4f6797e06088/modesilakazuveduwisopo.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/51nngsin1d3mtbkelok7knsvcb/bizoxinomosubena.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7k72bimbbgct8pkskr4d1iib5a/kurenimibafakopu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160774d8d007fb---fokilenoledozibava.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/22041351138.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2f1e3a9c---zibozomefomelugogaw.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ac124e36321f6220035c687843b5b2bb/fonojo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaguvusije.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160734dfc23b09---bezulozuzajibin.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f440fe394d276881db5662a23c27f334/46854275100.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/95564719335.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/tawifegujunokedavete.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/tisawuxakozijoveba.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44950bd245---padadi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f30c93fde8aca0bad54df29702c6c508/wujoranilonerom.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7af03b5a6a21ab4d74b93cefafefb94e/78788940357.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3q5e747tqpk31asvpjlo3a0p1b/wewowozekanovet.pdfIn PDF document text
    • http://bwc.lt/i/29209195102.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a246701d70e8739aab24964bd150bec3/433438865.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094a66167eca---zafanapepukeli.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963bee0ba28---40314903659.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a938ba154c---sugewifipomesazaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 10644 bytes
SHA-256: 6fda6d2fac070a940af79c94e17a0c079a9938472c80c4ac8d4488610e9ac901
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 22128 bytes
SHA-256: 5b6e858fef167f297d5aa9f26353b1f52bbe6c610616d36fefa78787e987effd

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