Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a72452f7ed8bb2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 09:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fad2f40be158fe01ea6bfa3975448535 SHA-1: 770c8dadc5bb5dfea5f006c859e881ad247d01dd SHA-256: 53a72452f7ed8bb21c502c9db3eada3d0e9a356b33446708d6d9e276c4c55205
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting and a lure for password-protected archives. The embedded URLs, despite some being marked benign, point to a pattern of hosting potentially malicious content. The document body is heavily obfuscated, preventing a direct analysis of its content, but the overall structure suggests a phishing or malware distribution attempt.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tselectromechanical.com/uploads/CKfiles/files/50265813207.pdf In PDF document text
    • http://gzcil.com/uploadfile/files/mimisapujilezafoteteloko.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/rikikerupimefipupa.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/48085072357.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/92958669345.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/gavejugamiwekej.pdfIn PDF document text
    • http://stevis.cz/files/file/70234575574.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/zizusilesawikavivapuneser.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e57d44a7f---71833811279.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210913013435_zrvyfy.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/jemejugetetevivufadudubek.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/8714976899.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/tagemurafofelomi.pdfIn PDF document text
    • http://hijoin.hu/editor_up/36214771363.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/nereguwabimewamuza.pdfIn PDF document text
    • http://compsult.net/userfiles/file/81698896115.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c03b73e643268b8c96f76a96f8e5662/24454435188.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/busavudijetobinerizuko.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/9811009535.pdfIn PDF document text
    • https://porfic.com/fotos/file/22184055954.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ngeoisjntmmt5s5730vkh9p0l9/47713843319.pdfIn PDF document text
    • https://12waktu.com/contents/files/govosixazegivir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=es+file+explorer+best+versionPDF 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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10480 bytes
SHA-256: 934fac369b2b29263227912ba869e358e9847de8409b1c87554d6f822dd8933a
font_02_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 18308 bytes
SHA-256: 0e5c1396490619332bf6d76950e7874d04730fd87aa66617992d3cfceb2cae17

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