Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c2a5c9629f8081…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 08:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b2bab54a961bad10311d717470c3cac SHA-1: 132b188ee46273b252f4ef5e483e3e5835641a76 SHA-256: 50c2a5c9629f808115b71fe69d452606811a5ed9adc031f58ad3aaa408c962f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

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 https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0874b66c22f3bdd65c4e66eecf91a810/83898071477.pdf In PDF document text
    • https://portalbime.com/UploadedFiles/New/file/fedagixiwepix.pdfIn PDF document text
    • http://msiutilities.biz/documents/zisofajonukituxu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/wibosufiratimuwu.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/5848558315.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/nojukitedujesivin.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/12980575523.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/losulobe.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/16508684407.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/dazipivu.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/98037210912.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f2c5075e1e43d5360155c055e0e8299/givatutonusuzeripi.pdfIn PDF document text
    • http://allycatering.com/userfiles/6419531205.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/125b7e2hieie72meaf2ru2c7b2/zunekenoxixovoj.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/41753853053.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/74561021687.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e8ccf6b8---81730796599.pdfIn PDF document text
    • http://fitviewer.com/files/file/5245759670.pdfIn PDF document text
    • http://gro-felix.si/uploads/ramevilixajajimari.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/vuzagijorawetipije.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/xonelizetam.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/5910102535.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/67880849502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=shadow+fight+2+mod+apk+techylistPDF 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_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 18120 bytes
SHA-256: ceb805c3298e1bd2334deda48198339599e0744708fed9eb04de2c4b03b9b66c
font_01_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 11348 bytes
SHA-256: e629f63ebdc150aa6a593e8ae9fad9b4d45f103caa0e21538db83fcbf8230519