Malicious PDF — malware analysis report

Static analysis result for SHA-256 84753143fb46ccbd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 02:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 153e96a164b0c83a5aaa69488e741f21 SHA-1: 027d58200ffb42eecb45e85b9a3f2ff915dc735c SHA-256: 84753143fb46ccbd113189a022ed829fbe5567b3dfab32baf0f1ef69be8b93ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, several of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://kimcert.net/E/file/lisijaj.pdf In PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/tinamugeliri.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cfa2bf36---20570338633.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/lowolomevewebes.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/82843480681.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/68101453485.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/13122531720.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1c10f0d5181ae359292a75ca9efc0e5c/vavumuzefi.pdfIn PDF document text
    • http://101balkon.ru/upload/files/26666075125.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/41697910450.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gisepajuniju.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/57375904070.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/82421250322.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wimilasezeliwotabevukurux.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/34898853593.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/sofovujemad.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/2190144140.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/87442694527.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/mexulowu.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906162033_2062480591.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b3451635---37475497784.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/labew.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/66574101829.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/werejomozulixulagoxujerep.pdfIn PDF document text
    • http://cloverdiamond.com/file/lefogugujokorilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=apk+editor+windows+10PDF 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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 10512 bytes
SHA-256: c5e20e8629136ec87966643cbee9b5752043090acfea7fade3491bc3e87a0f2e
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16904 bytes
SHA-256: 6404c94bf286a7a7ba45724e14bb68fa30b43ff788311604881d74e792619c83
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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