Malicious PDF — malware analysis report

Static analysis result for SHA-256 8657b0026dbf192d…

MALICIOUS

PDF

99.1 KB Created: 2021-08-04 10:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e1e9eb1604753f309566fdc9e4a3433 SHA-1: 356ec17112e1de3cb172334e68e6df3a3ff0260d SHA-256: 8657b0026dbf192d80dc7d7bfd1cbe3c2eaf777f82bbe93574e3cb051065d4f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=missouri+boater+safety+test+answers PDF link annotation
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/givadoz.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/warajimivadarulalisebamo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf60d0b26---27123030033.pdfIn PDF document text
    • http://sdds.be/userfiles/file/nukamuxakumoma.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/91230547244.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/feab79f141e116bb808394a74a35384e/batawofijosovupekun.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/xunamumezuj.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e92e71d30---9743028745.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9b17e582---jivuwuwenejanowoxo.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/88641246561.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0a471c9eba60853328af04430b4e922c/xibup.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/miporusedinaxowipoto.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/64d0e9438d012647a5d59c87024dc821/22957641266.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/wovasasaz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160763768a60dc---xovoborilulixoxuronesuzuf.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051304594870554.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/tobabogob.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/275a1u3sf8qjv7nmliekp6cqnp/93664993676.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/gevewadufudanix.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1o22pbtkk2jnp4s6pvu2512jq4/gemetopekurufulexopat.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/ledesiguxuwuvoxuzodadiku.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/ripuwok.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/sejogitaj.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_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 18336 bytes
SHA-256: c200d39b87cafd50edbcf44b70e317d458df6a2db1daf2da5a5bdc0361259d51
font_01_sfnt_off00014db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C8 10596 bytes
SHA-256: 555e4a193299a3dc266fd8e3c447ccc761d2e0e183e97e34eb3a3750353cedb9

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