Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefcc219554bebcf…

MALICIOUS

PDF

102.6 KB Created: 2021-09-18 10:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2b8eb272d7605eff480094ced41f6c2 SHA-1: 45ded8f50bf034c2150ec7e424b26ad264f59306 SHA-256: fefcc219554bebcf577c7287e2316b2dcf4093d6caacf75e6bec3329d4d6e647
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the presence of embedded JavaScript and a link farm structure, with several URLs pointing to compromised CMS uploads or disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://shriramashramps.org/userfiles/file/seputupofak.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/53093351910.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/41445382534.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5d71f700---83016309528.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/pigivufemaxijuxo.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/nepejesirosoledazokoneba.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/20064165570.pdfIn PDF document text
    • http://floramarble.com/uploads/dixowipa.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/gaxuminagepate.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/2735234276.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613261b9126df---85310774800.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142707545ff2---tidudujol.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210913_FD6EE5A1AB38D842.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/nuzuwuxukusifidu.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/gonavigo.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/rogazawazipe.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/lajizib.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/22334551338.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/waferukulofezu.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/28541896636.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/rarujirinuguvi.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210914_608CDE7C0B0FFB08.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+codes+for+fortnite+v+bucksPDF 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_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 10636 bytes
SHA-256: 4cb78fda63c84677389c62e78cc2759eeb8471c3534f7d0f586f22ee8773ad36
font_01_sfnt_off00013f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0A 20284 bytes
SHA-256: 9026c6a339bcc5495ffb6cd3a8aaf48cfd982955c2c83a65fa678dcb02f765d1
font_02_sfnt_off000174f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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