Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6b1875268c141b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 06:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 45b0c63e4a2fd5066e42d41194cece02 SHA-1: 14f094f49ef684fdff76cd4a09da2e02dd81aaa1 SHA-256: 5c6b1875268c141b902be1bad8c2ea9887a7f057730f1a511bf113ee94891b7d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613508141674b---96403802958.pdf In PDF document text
    • http://gpsputhuppally.com/userfiles/file/jusawosofaki.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/2225730625.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biloguv.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/zupurematejaxufinagef.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/puturarun.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jinevani.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/64722617555.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/53426258631.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kefotexija.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331419d0e5a---jikivugo.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/19517819827.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/3278391365.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6131f3966---50572966147.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210910025104.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/54072023908.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///bexanel.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/temevikipoluvopodaw.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/crafuk2n7f7q0m8vlvva11rtp9/kediwadivozovojarokip.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/69531265764.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/72014472992.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/nazepisokixexize.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/58273417310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+my+hero+academia+heroes+rising+englishPDF link annotation
    • 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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 10924 bytes
SHA-256: f74d46d34f6c1d85da4b77a49b13c16afb9fae5d3ddca3a9700e116f5c0e39d5
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 22548 bytes
SHA-256: 3b702dba4d7617fa636e36145d1febeacf28db357ed1ad585c34048ea7753b2e