Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bccadb99c63e06a…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 20:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb9431834cc9bf82e9441c60598ea2ed SHA-1: b180f5a4083756fad97355ee2e115de8758d32c4 SHA-256: 8bccadb99c63e06ae2b0b4ad763b8d46f22eb8cce9b7b09eaf5bce3e862335ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://ketchas.ru/uplcv?utm_term=assassin%27s+creed+black+flag+art+book+pdf PDF link annotation
    • http://alothongtin.com/upload/FCK/file/57394860374.pdfIn PDF document text
    • http://kustari.net/userfiles/file/30555350146.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ec1816fda47566d3b54fee7720952e0/45550505646.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/12905044238.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/xetesisa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bf66de0d591deb28610943196c7032c5/1539116740.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/64914967018.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/89883837979.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/59841570115.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/motoveluwunira.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/wupomekokolezeponajakak.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303008cf120---minowixixetiposiki.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/90616311479.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d82130e06c---wemarolikekijalubobize.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/762854e98d2c11b3aca53dc42b703c5b/16987633565.pdfIn PDF document text
    • http://klenderbio.com/upload/files/bugiwagudadepajizesu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/63519844922.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/bafabusuzegivutovemesu.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/60585230908.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109080935339778.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/38188968007.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_off0000ad3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC553 11044 bytes
SHA-256: 200022080dabd5a0d6b3c84cfc8883a6411e95a25cfd51ee52227c5311737d73
font_02_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 15808 bytes
SHA-256: 480d53e3c575915d29457b11113a243ea83109ebc06e8c4099aade48945ebc19

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