Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5cc6dd007869e2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 18:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b17315ef37fa69488cd965a69553a8df SHA-1: 2d643a720d092b01a56c017892d35e81ed1d0f38 SHA-256: dc5cc6dd007869e25a0e58812c37f7afb52881d2aa5bbec3ef595fd475fbe4ef
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. Additionally, numerous external links were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hasanmasat.com/ckfinder/userfiles/files/kenunuxatapidezozizuwuguj.pdf In PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/sapaxasisav.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/70774220014.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/79214061367.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/tavutalapeliwogu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/smpud19m9mk859sp6ovlsgt8er/kabixexinatif.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kifupis.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/97192110965.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/gavalitelaxovabirigirir.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/43710412731.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/23241777710.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/33801220147.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/liradoxavagufusato.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/81761935858.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/nizuguro.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/53006713971.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d346q82ohme8klu7880gfc4qr4/59138774332.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/10c08ca254031accbed90bc58fdf2071/mugegusedewuridugemu.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/74610232180.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/pajopozujizigazidovosu.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/20213928194.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/13928141559.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8dcaf712---kaniveporanemabix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+4+lcpdfr+police+radioPDF 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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 17488 bytes
SHA-256: bd2fbb4eea62dce23a5f2e20f31ee4f06f7a9d1280cfbe54aa05f09628f5a584
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 10456 bytes
SHA-256: 71e09b87a2ef08bcced84e26623dd70498aa00c9ba47133a6e39e4323a87f9b5