Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cbad80cedce948…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 07:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bdd818d49d2de751bb51cc3812964de SHA-1: 62b2baa60a84554904045f91d6b93cf0dbcadc6d SHA-256: 28cbad80cedce94846ceb6136cfb3b5a8af945df1dea5f32f3f000b02a731c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=korean+drama+app+download+free PDF link annotation
    • http://www.logomarcanet.com/userfiles/file/87794869736.pdfIn PDF document text
    • http://lgassociates.in/uploads/988440140.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912112654.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nememuxozisezepunevoxu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e1de6746a930a66ceffe25960518a482/dujifi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614296e9e2f91---70219619466.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/52622291166.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/41136273543.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/79471142470.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/72465363828.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/85982733251.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2326a89f---xepotedotutobomen.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/vorinik.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6f12681f4a1c96544518d22f45049539/15311332972.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210915_233743.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/revedewibov.pdfIn PDF document text
    • http://turnyras.lt/Files/file/judiloguwobojokifivep.pdfIn PDF document text
    • http://abnicum.com/files/file/sosoro.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/93279415751.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/62353113852.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/41053231397.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/64377032984.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/23896330831.pdfIn PDF document text
    • https://ijp2.com/contents/files/muburi.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/dutek.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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 10380 bytes
SHA-256: be6f1976f7141ca7728514590412da58e152558722624c4b3ab340751c63b9e4
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 18316 bytes
SHA-256: fc4c2c0934b69e604564d99fa5da75ef34078a610f84a83e9bfa9f44b8790857

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