Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1760d59c7fcefd…

MALICIOUS

PDF

81.5 KB Created: 2021-06-27 12:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e1d4b7708a96a6fb19adc9a0d89444ca SHA-1: 9287d9f24902babd968f00262cafbe1352996f43 SHA-256: 0a1760d59c7fcefd2ecfe42612cbee7365b702db3a0ae58727dbfd2e793da975
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and link distribution align with techniques used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5406b8a1587b14b0b7266e5e1392a0e1/4101930444.pdf In PDF document text
    • http://coffee33.ru/archive/file/91551874233.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/visodoniregimik.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/bidugejowamedifaxewojev.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/78524423018.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d92cdcba---48522394274.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6bb72d86d---97783517397.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/wumenoso.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/05dgshaskfmm7hqskds25c4vnp/nujuv.pdfIn PDF document text
    • http://plncse.hu/php_data/file/munuve.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bb47694b57f00e77eb8607945f722e9f/sefunidajabuperisif.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/32054007090.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/82997106663.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/zovikuputifawafix.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c0d0c8de9f229575f00c4f07549c2a55/39451192898.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/92fd07b569ccc3dd21ca3f2ff390f93c/82525060370.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/dumeridomufarofulalog.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608da757ce875---boxebojinix.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d431ab6fb9---josotalijavaxukofiw.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b23a4c1b---37936845413.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/nuwulafeguge.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/267f9af63df3bca50ec71bb145cf7047/29253900409.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/439ba98fca151c435340396a804de5fc/ramatavokojevatapizesoput.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/17638263305.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080378329701---wabafa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1315c80f---kipoxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=define+molarity+molality+and+normalityPDF 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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 17528 bytes
SHA-256: 323961e81ef545d67656f610287ef9ea23b7de96ec08852504195375aa98123b
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10460 bytes
SHA-256: fde51b383b5ec5e6dee1cc7e95a63a767b97f6043edfa16d1d45d90a760700ac