Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3da393908f6dae…

MALICIOUS

PDF

149.5 KB Created: 2021-07-23 13:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db987e2fd13b46926a3765213f4a7bf6 SHA-1: 0bc6ae84d54a9f269146671ed0c6c01fe0abc4f6 SHA-256: 1c3da393908f6daef9d0c97b03e12717e63b9eb67671bf6e0fa330512fb8d60c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to compromised WordPress upload directories suggests a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the links and the ML classifier output strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/8b751f30d3662d10e5963ae324389c10/novev.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4251cec4e1---40626681975.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/5361462932.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/ec049775ac487fc362ca3886d7ed6824/85348587172.pdfIn PDF document text
    • http://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/47320403212.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00ffbd277---dadasusodumotevomimidu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fed402d78---89210415647.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/joninesor.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ad024701---64104766557.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6bca23c17---10374168049.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7f89e9068---ziwusigoled.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607270f58f8af---jetusizesalekonadawi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3295ec850a0173274b82d2956b503ed8/ribunatuxunas.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8f7fcdee2d759572c9bf750fc73c9318/sodisoru.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/rifow.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/50376260202.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2f7d2ab857445631ad84e509da10ac19/nikutusiju.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/44484077195.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/barewafuwotapewozevopu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fl61r9ju7t7mhk7uivebgup7le/45842720424.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/39e2adbb68b89624eaa5311ab5898322/15038842335.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/xajiforasepazad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=big+words+beginning+with+bPDF 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_off0001ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA13 10596 bytes
SHA-256: bd4cd8712f70fa750c574297e73eee00213150dcd4663bc9ed3a268fb57a1798
font_01_sfnt_off0002021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2021E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A30 17316 bytes
SHA-256: 99e5c78c7d98c5879555166d216faccfd812301bd539909b3fbc14b336007c63

Open this report in the interactive analyzer, or submit your own file for analysis.