Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfbbdf55c5ea9bb…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 20:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: daca06f593be1e962b7b7355785b9c8e SHA-1: 9121ee0e051ae3a358598e0e9f7cf3c9ae733dd4 SHA-256: fbfbbdf55c5ea9bb7a36931f23f0b417de8c25cd62ffd130ecd4724a5e90a638
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of multiple links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign, likely using embedded links to download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44571cfc50---99804322423.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5a2db17b4bce323ba0323946ee71e3d8/82225875612.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/821d63011f2c6dc609dd8c07b6f6eee0/sotedujijepadij.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/betujowev.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tutaz.pdfIn PDF document text
    • https://grandegroup.net/files/12180695987.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/rezejuru.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107240852128964.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/75880262004.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9ba67a26332686759869782fee67c520/81479702031.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1303e7adc---pinirejetop.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/tokum.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fifobagarenu.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090108492228.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/nimojekugaba.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/57478570922.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/66942376771.pdfIn PDF document text
    • https://austarpharma.com/upload/files/funiwusewemuxokorabejuvoz.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/20642363860.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617163558.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4b69ed881b5839b28fe2e7eccd0dfa15/gololilapokimomamoxevodu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607153f444ebd---sasovopaxok.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/99113373810.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9c1273a15afb3616f59fed5da56ffa59/tevubodure.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/judebemuxevuzerepalas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=edit+pdf+read+only+filePDF 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 10420 bytes
SHA-256: 814f33b5d5fd00018160fd548f54b7d1bccdbbe4d2d6f9498155c29535f1bcd2
font_02_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 19908 bytes
SHA-256: b0d09e2db1f748a4eb49d103f8445ba2af148ef6e4b77078056e765e365f492c

Open this report in the interactive analyzer, or submit your own file for analysis.