Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af8839abd0f92ee…

MALICIOUS

PDF

143.3 KB Created: 2021-07-27 21:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d2f00aba11e5d41fef80e6320fffaf5 SHA-1: a544fa1b790d918c3e4ebf30c26fd5bc35e901fa SHA-256: 3af8839abd0f92eeae4dbaa90aa415ef9e7d3b146d4e6311d274fee316e08952
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggests the file is designed to redirect users to malicious sites or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jyotiacademicpress.org/uploads/file/26792037893.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/212dccf80456f597523524a9d463d055/lujom.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c530619837e---90816350597.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/soledororavafebifo.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/25627344733.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kunokerizido.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a11074680ee---purodotizaj.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/96601204014.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b846ea9172e---9969896923.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608dad9308b03---72726397604.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/70b8ace3da8e978cbe251cbaedc0be37/wegerisokogozuzutibe.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/ribinifuwe.pdfIn PDF document text
    • http://arslanemlak.com/E/file/bolimisivamomo.pdfIn PDF document text
    • http://standdominica.org/files/files/suvigamebapokabozopabeb.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/fojevovanomovujofobesolu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864fd2ddd50---77789261197.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c528cf15b366ac7ef6a2b1fe9031e2a4/10979826141.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/56064026959.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/jesakonumapopu.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/lolavuwazuwobu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1db8b10d---65506260599.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/japolilinegalotukup.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f11364f5813442304a3015d8337de8d0/56448411024.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/rezagiputadanimutagirav.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f123fc566089fc60f6fca9e725044bab/wewakubotupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+hello+neighbor+alpha+4+para+pc+utorrentPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E04 23552 bytes
SHA-256: 7ac3b960247a74bf058e12a97b33b15d1a489a4520038759d774ff77570f0927
font_01_sfnt_off0001d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F097 10972 bytes
SHA-256: d7fe73ab13d299a9692d99ba7fd81c2259de2a69155c941ac3ec91495d4f8a96
font_03_sfnt_off000209cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209CF 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_04_sfnt_off00021f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F45 3116 bytes
SHA-256: 5b76b6d27eb0163237b8e958fb5ab8b9bc9135fadb95d1158285c881d8f91cfa