Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5f3f35f4dc24da…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 05:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 764abf1b4832f31a0edaa21cddc8fb86 SHA-1: ee0713a2ae63b5040be4be5ca50a8c378c349dd0 SHA-256: ad5f3f35f4dc24daef2142a0cdacde0a95da22fdc43fac3c4474bf4037489f47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple URLs. Several heuristics indicate the presence of a link farm on compromised WordPress sites, suggesting an attempt to host malicious content or phishing pages. The embedded JavaScript likely facilitates the execution of malicious actions or redirects the user to these external resources. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6d2a6fdea599fda6f32d90acaa0fd87a/10045192825.pdf
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/22348811963.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/56457110349.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1a8a8e616---zalovujuxawigabitizu.pdf
    • http://braciszewska-klimek.pl/fck_files/file/68352170620.pdf
    • http://dentalclinicbangalore.com/uploads/70330102974.pdf
    • https://art4you.sk/editor_uploads/system/files/xagupudolijegobaw.pdf
    • https://creativitagh.com/pevron/www/img/file/jevuzum.pdf
    • http://irths.com/upload_files/files/muwekurutesiza.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419afce9e62---93529057303.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/tusudizulitisewunon.pdf
    • http://csigikes.hu/admin/fck_upload/file/vibulejaru.pdf
    • https://ibshospitals.com/userfiles/file/setabofazadewifalazofetix.pdf
    • http://medicamarsala.it/userfiles/files/48281499576.pdf
    • https://xtrafitcoaching.com/www/images/files/demuniripezatipof.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/wajoretuji.pdf
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/muzifukififigivoded.pdf
    • https://veaodaibrahma.com/uploads/image/files/42286949051.pdf
    • http://vilniausgreziniai.lt/userfiles/file/pobejazara.pdf
    • http://fukaofoods.tw/uploads/files/202109090645443406.pdf
    • https://baxsporthorses.com/userfiles/file/14511290892.pdf
    • http://fratellilongoni.com/userfiles/files/55745403795.pdf
    • https://ms02bet.net/contents/files/32337976978.pdf
    • http://artgrafika.cz/userfiles/file/65384231180.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pepsi+man+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b35c.bin
79714b9865aae8ac2f1eecc4326031ec239cb103be9a048140f4efaf78b7ecb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16804 bytes
font_01_sfnt_off0000dcf6.bin
7dc18d64aa2d7b998aede2df2b1a74995d7ac5f8b63f7b6cd833e4be745c7269
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10532 bytes
font_02_sfnt_off0000f4f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 16792 bytes