Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e091f577d19769…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 05:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0d7ab453008307815c883ec045ef242 SHA-1: 33983bba5f0689fbd0242a2697e706c2d74a3c84 SHA-256: 03e091f577d19769749b0a3ab810d45c9d49517d2e49c08c3c9d7a7a37dcd5f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://noddy.nu/images/file/nuvovavopiki.pdf In PDF document text
    • http://sportgalaktik.sk/userfiles/file/tizejepinapikoladeteroxik.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5eaec07f93---lumugizonopumokatugelize.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/83404308128.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210825124232_s1w7f2.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4dd2605d1---pemuvexasaro.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4bcqhfe0t2vjg8utjn8h7l1dqp/70872233912.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210630_37A92620C0C9DEAD.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8297314ba94caf5fefc14a42f467a96e/80700363169.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/8423d6a2ec87133f61c3a811f063d645/sajapere.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/sedezubune.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08f153260---genazumatobiwuwame.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/68493836840.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/welujowevurinow.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/zatenukenase.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/38669096513.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/98016739263.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/vobosimawixoratapemi.pdfIn PDF document text
    • http://tcihk.com/userfiles/valodakipawulasug.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/23252012203.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/xulajarerovad.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/5862475612.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608098e13d2dd---vuxiveluvotiberekumix.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/53771964403.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7a999eb5---36578379332.pdfIn PDF document text
    • https://defi128.com/userfiles/files/20948370529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=addition+and+subtraction+worksheets+year+1PDF 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_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 17500 bytes
SHA-256: 9eff5d0f46746fa45260bfe7edc3e2574732debabe23177bfea72c0d5c3d1517
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 10988 bytes
SHA-256: 746771da8cde188a6a6caa70ee4e575802ecd831c54dc87cc7bb3cdc4a8cf5e0

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