Malicious PDF — malware analysis report

Static analysis result for SHA-256 e865831f11265a56…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 21:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3b44595e4effb4ff5f59e0feb1f2695 SHA-1: d7d86af127c0a8af58de9d00f2112f6e7c2ef653 SHA-256: e865831f11265a560f29a9b25a71bbde7620070ea975a9e11d9aa43f3a32dec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate the PDF is likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3556da19c9---vukotegimufamogolara.pdf In PDF document text
    • http://acpiindia.com/userfiles/file/kerobojoxirowafivogo.pdfIn PDF document text
    • http://charivne.info/images/file/4622847321.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/39774163465.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0uddhheredbuk9psigc9sfut5b/378171181.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4bgqaumbj7m464i96ec9jfer9c/4931486283.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/74185606770.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/clvj0e6huiaeb6egkbrf2kf5m7/57538743495.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/73428863ed3975cad906612402538d44/suwimegebozujigenopaxiw.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/35247444028.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/76741575842.pdfIn PDF document text
    • http://winso.tw/userfiles/file/relinidovafuxazavifegiret.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ac4e9753b01a8913186b074e35c8d819/mukawojifoxoderexavodu.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/85342283117.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vagewidawuzagododujogomaz.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jewona.pdfIn PDF document text
    • http://paliukenas.lt/i/File/jopedifiritolap.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160878dc0e5c87---didodiwuzajazimirusit.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/14228235653.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9856698b104062bdbacd2c4e13f9e778/72929244900.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/69826438811.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vubakadonikaxegitoxovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grown+up+christmas+list+piano+pdfPDF 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_off0000c5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D5 10976 bytes
SHA-256: ccfeba1de2fa2b734ce31aba0a96fa5beb45e5d0897c142d55bfcc96cb7d89a7
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 17716 bytes
SHA-256: 3b8cb00eb70445915c7345d1df2ca9d710e9aa689329ad19f86c6e2c28cc5068
font_02_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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