Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd65969bf55c5df5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-28 08:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a6000427139888eb18e4ff9d39e59ad SHA-1: 42b47179a7790a249b617b7c77fd86d07da1f594 SHA-256: fd65969bf55c5df566d4d2b6094c9d2c9647a366af296b57b3e65aa2642e9eaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure suggests the PDF's primary function is to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=android+internal+storage+other+files PDF link annotation
    • http://nataliashishkina.com/userfiles/file/zibetiz.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xivebomagaxupiwut.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/fukofinigaleravite.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/duzovufexovumoret.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/nevupuwiroxixezem.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f35c24f880df410b00ea24c2869af0c9/raduvutizusikotez.pdfIn PDF document text
    • https://cowik.pl/upload/26699310100.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021092302302673499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610bdcf8fe---78841903128.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/80932555806.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/setutisalosuwuburesomeso.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/60542582147.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615278fe4f636---87389068313.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/temetafusezageronisoda.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/49b9a5719745c607e0c2c8aae87bc27c/2656189915.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161466962526a6---74165799468.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/pefawipasuka.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xokikem.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/46122630215.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/29142976822.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/mitinunepapinofokim.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/latala.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136712460516---vuminemelaz.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_off0000c1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BE 19692 bytes
SHA-256: 86d707dfef23bcef1298c6146c0e2cf9b0871b5bd209eb5eabcfe5f067c6aa8d
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10616 bytes
SHA-256: 271d07e1c2407a8d6db66e9b1eb05d262db543d204cebe8c3517b520bda7a21d
font_02_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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