Malicious PDF — malware analysis report

Static analysis result for SHA-256 742ecd25561f030c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 23:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d63dcd0f7018c87cc9f7c32495a05e7c SHA-1: a3a65cee173a9289781f2c4f6696ff7c285a9d9d SHA-256: 742ecd25561f030c46dc9b75ec0c45097c3faa9ea1c1dccd5d33daadb534d527
196 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 WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/63rff999u7ulb1bdam7265c647/tibifovupetatevon.pdf In PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/xagiminifejubakumewa.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/53414446234.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b259d8c2c35c364f8254c69ac4903612/juwafototofurejasezirulus.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/safegizagemogo.pdfIn PDF document text
    • http://jucal.es/images/file/66093150110.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd89d8419---tepanuwotamukujegurewaju.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rn367ojg214m4pbeue1dkta23n/60508815193.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/74026908495.pdfIn PDF document text
    • http://platcometals.com/images/file/44414440069.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/48661197565.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/zonasavusekozibupatu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddf2488a5e---wiladamaku.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/vidanipetegogigiwogozo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c31a4ff1---87954014238.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5952ab79---donugenojixoko.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/68498923431.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/xevavexigiwimatazu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///nafetusagogerep.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ace7de4ae5e36752d289361a61167868/gularixomikifa.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/lixolobomis.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084004bd2473---zutulagize.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/guxevozazawakovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=shrink+pdf+file+size+in+adobe+readerPDF 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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 10864 bytes
SHA-256: 34729b1b94c192aa2d9fc940c29be1305a4a21cc550bddbf872009e13355042f
font_01_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16292 bytes
SHA-256: 71ecd037fc65c33ed0a766ffde601cbdc0e73c877d3c9d2dc5d08498617a909c
font_02_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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