Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d810c68e380734…

MALICIOUS

PDF

91.3 KB Created: 2021-09-08 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27ae03ef0c15ff926536c8df7c4ad03c SHA-1: c41ece660097712dd7c772cffc57becc35aab8db SHA-256: e4d810c68e380734a4a78b07adc77808091830f00ad4e61f79002ddb941e2dee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hunghiephuylog.com/upload/files/mojelujulorisabokugurobal.pdf In PDF document text
    • http://185.33.116.145/~acus01/upload/files/nodonuxuvanazafokezo.pdfPDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f0c0e372df0dafc576c906a329807b38/45745886820.pdfIn PDF document text
    • http://vecsecity.info/editor_up/92483460602.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/99202777554.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/46668802799.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/16480477751.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/vafafisu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/13442086630.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/37027807190.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8816b8aaaf158ab2a7da90fbb8a46c2d/3995714684.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/47861ehv8ictfap97g8feef6u1/64008024755.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/mugefevemerobogevanukex.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613101b17b0d3---tozizobagufefopepimini.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161359b645c855---54583091652.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/tisebobiramagufep.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5d30740a---58153527718.pdfIn PDF document text
    • http://protok.pro/upload/files/85796714930.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dc227b5b1---45584459067.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/tinibopesozavolun.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/kufegolo.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zujemawuxereveto.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c4896a0f359bf5f59db69861283ebdc3/95296259860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=silverman+score+pdfPDF link annotation
    • https://lapdonline.org/file/14932439294.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_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 17440 bytes
SHA-256: 5b66a9abda40a5e05a872b9755b9cf32482a5d43568ba4e68cdc4e46a632e99e
font_01_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 10824 bytes
SHA-256: f74d3c0d9c2761b30d917171c91790c4b0c169f1f59d0934781600f184e3a5f0
font_02_sfnt_off00014783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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