Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f9c11eff96c26b…

MALICIOUS

PDF

76.5 KB Created: 2021-06-27 18:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14fcba485c72894c21b529065882dc53 SHA-1: d227093c209e7debdb410475e767b9f74350314e SHA-256: 33f9c11eff96c26bd49a389ab1e6a39585228ce869f0942f328b873d46ce6807
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to exploiting vulnerabilities or redirecting users to malicious content. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://kiemtoanhaiphong.vn/upload/files/doxigemibigoliworili.pdf In PDF document text
    • https://rowadalbyt.com/userfiles/files/30365872213.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/svljtjse7omhdgnklsfnpkhj0d/kibanajinamog.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6678d77f7ae5fb247351c28064bd5714/togixodobapudasovedujeli.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ovi3th8nj6cna0ku4fk08ejpf5/jubemu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/jivufokamizuzewobag.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/j3817coj46vfodc5u9j9eqfeuk/93915685598.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gurewufelojom.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ec2b4a68d54a7a507d987fa0781946c2/53640938538.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/89a7f081af319c9d951fcbf90d4e50f8/bametivumaxuza.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dd6be3f3---58636497222.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/36815167742.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/daffb2a4a3b336540d7d6ce085be101c/65017861579.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/61916196805.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1ede94956---61933445368.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/k613nfo4aq7boigbnfonmm1smq/60071285558.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2a813cbe---38123709167.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nhc98p28e8ckaon91h2udtno91/68654568171.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24871f611---vusopopabulajegu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1ff58c2b858500a6de57942b9488a697/7197368557.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sotaxedol.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a12c1d54---sakamuduwiwijinexawuv.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/87623608798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+science+and+engineering+of+microelectronic+fabrication+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7B 15824 bytes
SHA-256: ef2896cbce7512a25f2b9db3560333a2984cb417d65af3b1c84c0178c16a74bc
font_01_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 11172 bytes
SHA-256: 1bed7bcf61d8e547a741276b1cef4109737189a85d6543aa07cbd565953c3964
font_02_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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