Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3a9ffd291e0ab0…

MALICIOUS

PDF

81.7 KB Created: 2021-08-26 11:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 996b2510714e0624473fd8b5e0922fb2 SHA-1: d35cb52e431d55d5718374c65620db61281418ed SHA-256: ae3a9ffd291e0ab0551a4bddbf38b2e35de4349b8fef2c49863b38ef739143eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristics indicate the PDF acts as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute further malicious content or phish users. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6cf0176d---bazimiwu.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5dd5636a---5799403012.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/80329764577.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/68749596914.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0422c719ab---gufofanudur.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9d10d2676cedff9554e2f7f7d5215958/55600006575.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/zuluxivigu.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/pusakonexasejejogabej.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/38258602289.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa8898c013---83924259115.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/livas.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/xerusatejukakasetos.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a867f3c1---kozufawogevagezupinut.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/62351872197.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/vijonelebuzomujulaziba.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/65242598043.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210623203622.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48728d8c2a---wanolujomajonibowiweg.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///90954548567.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/diosed0pnurnuugvaec54fackr/xazujon.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/22861159683.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wazevu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/45e976faf7e034634e7b4ec873fe98b8/18920157602.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///93296031366.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/vefaneteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+quadrilateral+with+opposite+sides+that+are+parallel+and+congruentPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 17516 bytes
SHA-256: 7f573d47f8dcb81b7e9547c208574f02ac2a4019c3832cc80a8e4cfbce6da6e5
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 11108 bytes
SHA-256: 71316ac9703688bc2edf93a7c64182883a8e38d9dad2821ac07f607e7040ce8b
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1