Malicious PDF — malware analysis report

Static analysis result for SHA-256 c142bb6f4b40407b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 20:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e09e6850ff45f6cc181dc32aa4e2e1ee SHA-1: 803cb44c47060f4f25a6c0cfcd6dfbd98618ea71 SHA-256: c142bb6f4b40407b994816124a929eb0b9a6b5c0ad142e84e6fb37d01677207a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to multiple external URLs. Several of these URLs point to compromised CMS upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=my+country+apk PDF link annotation
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nugipuzobiti.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rijuvuwujo.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/19138940272.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/42593332712.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/sosawonoroteroxovutekas.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/2276867245.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sawebuvoluzesegig.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8945b4a62410d9ec85312b8303ca450f/korusemetut.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/wipogixapopufutoguga.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fufebuxi.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210911012121.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nutifisa.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/pitaborulevoxesidajagedu.pdfIn PDF document text
    • https://servicepapik.ro/files/sibofosutujino.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/nidavesifitonovan.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/8746149571.pdfIn PDF document text
    • http://dd-eng.com/files/files/67163785597.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/bimunaboxogegurapavawek.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa2ac1177---dufaxojukivubigevoga.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/35167032047.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/41092635582.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/paruzegopoduvowokirabelin.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/38038011954.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/27530827934.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/54eusamffltup0qeljndjsidmg/44131398914.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/todobimiviraxugegodo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/76521e1eefdc977db507452990f0aa4a/monobepuxifikami.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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 10228 bytes
SHA-256: 6c4840842b41f640bb60837480e088e741dadd858e2992555c847d4e2a5e9dab
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 18276 bytes
SHA-256: 763c7069c6a04383b7797c697beed6982e1de9cadb9901738c75e704b5331d70
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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