Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae965e895f9cce4b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 08:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4574fac35a0862f3337e80d3aee2b9ac SHA-1: bcfc53627ea15f00a58a6fe65df8528c25cd82ac SHA-256: ae965e895f9cce4b91939a233fa1ea905b87ee8f2d1102f412b61117f8985dca
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and a link farm indicates a likely intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://saintarseny.ca/sites/saintarseny.ca/files/file/lamisamivob.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/95421619820.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e246161a2d---29152462580.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/82490385256.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120a6ca2b14a---domarezalogomuriza.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/jifavodegenofekusuvoko.pdfIn PDF document text
    • https://emmaushuis.org/pages/24591231615.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088775235c37---simugavarifukifararuvu.pdfIn PDF document text
    • http://prosquash.by/data/42495436888.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/kusediwovemunagiwebop.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fdc43256d99b2c847f5fd1d006542902/wamopugino.pdfIn PDF document text
    • https://podimercrm.com/img/files/85301830581.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/pajafun.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/37710909155.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/41640415502.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210613_2C47236DC78524BE.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p4bg31jbaefod3d0ovo9n2rc22/85295909907.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fd10055---53069997232.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/85477352207.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/junuzikebonemujo.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/27471869550.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc3ece0845---vobumunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+build+a+solar+dehydrator+pdfPDF 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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 17324 bytes
SHA-256: b8404ae6d21a486c6d26e841cc8a5c1f59cda415f9017a6cc550c1f599123777
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 10920 bytes
SHA-256: 5462ad85f3db3078456618423959a9342cc230fc94ae04b5974749f30f1c0816
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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