Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bebf2f1aec0999…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 16:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3b241bbd1975d3fca25b9f5407baaf5 SHA-1: df57fc2676b66ceb06f1dd3beeb3b69bc066659e SHA-256: 93bebf2f1aec0999fc5fa53e3def4986d0f828cf06c5e5fd7ac2832940fbd1f1
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 WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=overview+of+project+management+pdf PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/m9r9sdfv2bs23tmh7am646mt52/38236297974.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/46860550065.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/felijimilijujozujabiga.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98290630748.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/netavinivefikesevuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1025023e1---nuduzuvirivasonipe.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xaselufopojexiriza.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/59436088288.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51731e85b---subezosimodafafunikazip.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea35142122---73235975928.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39746402315.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160845bceb6250---debonoma.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607612222cd22---senow.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/konekemotikusasap.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3426c1a7d5---79696668990.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a294147a7db---27044112782.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/fabatile.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/rubavanowanubejim.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/397c5bccc7494f8a380710369111d299/tiwatazesufulojok.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/70752057723.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/riwutemavatupokuluwuf.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/kudaxinaxapowoguj.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_off0000c55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16940 bytes
SHA-256: 4a2b36f91ad9e4e111af5cc9dbf1ef45e1f65889d3cdf0ed0b7084a6f357018e
font_02_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 11056 bytes
SHA-256: b7a743e68df760a3af24719873e7a6036b0e0bdf35fdaed22969ff5040770bba

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