Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12252887f9f2292…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 05:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7939750cc5d952bfc76055b04027e4bd SHA-1: e1067f1051487b81f6137aa48c1509aa5656c944 SHA-256: d12252887f9f2292aa745d9fe235fdfe05770bcbb3d69fa02ac68de4eaf173ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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 http://cross-winds.in/upload/contents/images/images/wabisedipesa.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f203d4706---58624196279.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/2885654518.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kedaku.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/44781210907.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/fukanetetunakerixurixo.pdfIn PDF document text
    • https://iword.de/userfiles/file/12004966512.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/tutifez.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gofuru.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/64803344058.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/47202595436.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/zagonodiximab.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061635573617.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/fotetibopatibusa.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/74796894751.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/3775555768.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/7287137489.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/bofotigudolovesumigasirix.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/rejavoxuzokakirosulu.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/kefetedajopowo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1595f536---zumuvamil.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613666551793b---tugamerebiguduzodage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=petrol+combustion+reactionPDF 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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 17320 bytes
SHA-256: 30879ecc7f4db3b7fc45c1f34cca629a29762bad884e52e66d39c16a76d475a3
font_01_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10632 bytes
SHA-256: 4ccf948227f0277410584c9f7f414a4012b574ef45510a347dc2e02a9e9a5912
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1