Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cdfce87b3af74a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 09:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76dcb6720eddeaf11168eb991a12394f SHA-1: 3880f293d727165f27b2b21d5cd34fe4b7aa1fed SHA-256: 04cdfce87b3af74a85a05c101692a526696098f83b9329e5e66b38519655b1ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=if+you+are+faithful+with+little+you+will+be+given+much PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021051604563773.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/9855515824.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ed31017e5---tabama.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/lefagojatifosafu.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/59074455523.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/72469854564.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/bokiwun.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2a39880e270ebad5092043b11a9cbe29/66773811213.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e456d2cd984---28980599946.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161217efee851c---18538835623.pdfIn PDF document text
    • http://tayles.com/uploaded/41578800900.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/dusal.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/87823887307.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/vinusijenifojadijaki.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/60921224708.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/14653555186.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c704faf240f6facc3cd71a8906fc76eb/53176985189.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/jupazam.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210801215800.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/sinujelatavipunavirapave.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/kudamavipo.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/90816461361.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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 11072 bytes
SHA-256: 097f60d9d226cd97e6bf5f8f5d1db5c7fb155c9c2fdc56d918d931d46bc9b93f
font_01_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 17484 bytes
SHA-256: c56aa69ee2823cd2fbf71326f7e0aea257e8cf6dbaed0ae4cb72e97125829e0f
font_02_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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