Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab53fa0a1bcaa1ee…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 21:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a2d920c834564ec4bb3ee3f0d494afd SHA-1: f72668e00b25edfd027df663bef1d10766c9e023 SHA-256: ab53fa0a1bcaa1ee09cf44f4196a15d858099c7a25abe604b54b138c03378ddc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as redirects to phishing pages or malware download sites, aiming to trick users into compromising their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gloria-eurex.com/lojadib.pdf In PDF document text
    • http://vencedor.coop/images/admin/file/92644104390.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b8b3cb1---11550062273.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/r2lvlnv4kuvdjkte1qqgd965l8/4392436399.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7caa076eb---83949679038.pdfIn PDF document text
    • https://atl-50.com/files/file/witoziworazuvol.pdfIn PDF document text
    • https://laser123.com/geektic/files/nibozunerijusa.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/soditetuzovetiji.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/014b480de8107baf27482f98dca15f69/49915955631.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/93196735602.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/85902154714.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/3991612447.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e290b0811---sopegabozakodepidon.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/45995665597.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0847cee40---pijavofadilidofeleleza.pdfIn PDF document text
    • http://614move.com/clients/4890/File/wotixarepimujetonuro.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/55d736d23697f35b9007cf2c33b00565/somimalitox.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/35cc36affd1713fac435d53770e187d2/fivizakisegasexipasiled.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/juwinebabopadofep.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/82285132853.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc812474b87---50950687149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+english+file+fourth+edition+elementaryPDF 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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 22496 bytes
SHA-256: 52ef845942e14d0c59855dd629525d089e6215f3ed5674046e5eb2217b2a0896
font_01_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 11080 bytes
SHA-256: e7a726c3a2ff3a760ec20a36087b2e079dc6207261ac256016fa1d68be98c1de
font_02_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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