Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1cab9ea19d1899…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 00:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9e8269b1344d227ee2edc397a01469c7 SHA-1: 6239acc840cd134aa7cc693c79cebc6442913b52 SHA-256: bc1cab9ea19d18993c924669b9794d0c8c6b4f23b86da1fde581fb4d5ea92185
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' in one URL suggests a phishing lure related to account synchronization issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://chcial.ru/uplcv?utm_term=hotmail+not+syncing+android PDF link annotation
    • http://juha.be/_files/file/866301477.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/14324261177.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090718202873499.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/fejozaxexudixete.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jeriwaxavuju.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/10053127517.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613154927258e---43583724444.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210911115918.pdfIn PDF document text
    • http://synphabase.ch/upload/file/37805680882.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zadivupebonerusak.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qonfre7248jtpgu4pe6of3fc31/sojovolagaturuxilasut.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pumolomovovogu.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/23273647576.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/55904106892.pdfIn PDF document text
    • http://chineseclothingonline.net/File/56897664830.pdfIn PDF document text
    • http://art-ball.net/files/file/23135267213.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ketefozapexegof.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210907090637.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/gufuvexisegerodonukob.pdfIn PDF document text
    • http://feg.vn/uploads/files/29998521809.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/42572037124.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/ginevojivirawutaxoj.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vesuxure.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/nefofefovego.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161338c1e11efe---lopubovilegasudesunumanu.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/wibiboxowenoda.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_off0000ba0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0D 16348 bytes
SHA-256: 958036837a802815c6ae24b9cc49d4052b3a7cae0b2f13d21817670f8ced531e
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 10688 bytes
SHA-256: c73125aa54253bb209b892097943571960baa81df51644e837994e5e5539519f
font_02_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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