Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e73c423b4c00f2c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 18:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7755b2bb30d65bf6e0c9a4965df10ff SHA-1: dd946e993f2362979bdfca7969eefbf996e761cf SHA-256: 8e73c423b4c00f2c938d2b704667473dab95bff1b323aff172ba1f6181a55ada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or 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 direct users away from the document, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=telemetry+systems+engineering+pdf PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/981d445195106dd5d4e55a9c294152ad/65749839313.pdfIn PDF document text
    • https://hojoairport.com/images/file/tofinomepefu.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/59076131297.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcba4ce083---47865062144.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/nuxovusubutudetidaxetefu.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/viwifokegiga.pdfIn PDF document text
    • http://sentralperdana.com/file/63756488350.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mgeoi2n8qhe5gop4b8vp8g2m38/lexeganolegitejugasuke.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/11492492700.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/kosisiworanubaxenenazebak.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281fcdbc96---13235234581.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d13e1856---bezejufekadejilozotal.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210813155953.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90e859641---katijujilixel.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/11744597441.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/2279829518.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/41866212085.pdfIn PDF document text
    • https://cncunse.com/d/files/fupulivorinabodofatane.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/74663936567.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/53mlhrboh37h5v7qtmoflj68h5/77274952540.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130367b5fa5c---fafebobonerifolilatogez.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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16980 bytes
SHA-256: 6e98a7237ed05c85085004f5bbdaaae1d3b8e3c6cdbbe71b07167bceba6aa6d3
font_02_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 10636 bytes
SHA-256: 84bd288e4aab9a452dd49e13a4d610723622c8d83fc20d9270aa7e733e1a69cf

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