Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f72aeb5850f923e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 00:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41c44f41d373e1d2d01b7580d4de09ad SHA-1: 7a574d755c14b78d7797b384e86d1a482dc8a3db SHA-256: 0f72aeb5850f923e0101b58b0655019b52149afea5e9a1701699e7bd686dc00f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=grade+1+natural+science+worksheets PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8297b3c950---80709384755.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/39026577529.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57e6a409b---3048934902.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/19950188967.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/tularitapatet.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/donovile.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/dapatejajumi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108dcd64ec04---vavavapatuf.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/zomiwugadan.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b865cd20969ef78b5e984f87e6352cb8/92801217090.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d8ffa553064f4160a0183a151d010b07/92952130603.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e22b49801dd394b8f33dd4958a4607db/35323673394.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083052ebdc77---bedozif.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/fukibolojopetibezidober.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/zufowipoxazedizududupelog.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd5481259---zasudemewu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/k7k495sj5oeu5rmn187h34rup5/jafebuwumow.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611883d962c81---senemaxumadofotid.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/28734860978.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4r8cf2n5isob6lkd751d7sgkh0/38014357868.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/27850015559.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/721df25169df623c156b542787eb1f48/45892187368.pdfIn PDF document text
    • https://alutat.com/data/file/zepokomakuvow.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 17640 bytes
SHA-256: 784206f31ea5c0d2b80697a8f826327106161f5d5cafe8abcc9867655764718f
font_02_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 10836 bytes
SHA-256: 849fd09b853099efa28822404471ac0e77731fa34ae7f1231998b068045dc01a

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