Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e36816ea952190…

MALICIOUS

PDF

101.8 KB Created: 2021-09-05 00:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97316e0c890b7f31b9a0a1fb8359eefc SHA-1: 173100032fa30f33f0a89326c257b59e9da05350 SHA-256: a8e36816ea9521902f20b1f519cd2e21fe9d583cd0b79457657b39b78ebff9a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of a link farm suggests an attempt to obscure the final destination or distribute payloads across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sistersaviopublicschool.com/userfiles/file/gozutanigametosisodedaz.pdf In PDF document text
    • http://aplus.to/userfiles/file/kijewemubox.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/27227022427.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/14459283968.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30255cf36---bagifatored.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/jidapozemubemutoj.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d2d04f96e6afa58020d9cb93384e4286/fuwokapavevudaradarutox.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/powadiwiditolujewejef.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/46872391497.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3ef8019ce9bdd5ef7614bcfe0497ad33/545557854.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c084d265976d16627328e1ee77a052b9/16415964709.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/ramawonuwomutap.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pomirimoguzekokeluxamuw.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/62455568900.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/59644715540.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24b7e7264a---bupatinujukope.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xuxefurijenokebazafizug.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/sexadefexi.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/wered.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wenisavero.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/jofusip.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/l4erhdbilmd441cq5ejum52af4/karagukuwa.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/7228995901.pdfIn PDF document text
    • https://drsaman.com/files/68219170772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=elgato+hd60+manualPDF 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_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 10576 bytes
SHA-256: f8d6aaa6f4a99ecb6f9bc6f0d5fe575c673df34be63ac674c2b7b0aca0d98e0d
font_01_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 21024 bytes
SHA-256: 7758bef97aa66a5fdbab011ed57c21d77e371eedc4015292fc9c6feb403ddd75
font_02_sfnt_off00017133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1