Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a794c87d169e75…

MALICIOUS

PDF

80.0 KB Created: 2021-07-30 21:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb97eda35a838d2b8a3f72a666c335f6 SHA-1: 9aaf3237914df254f1fa8b5d26d423b7e7aa84e7 SHA-256: a5a794c87d169e751b11adaa65b555035afaeba7a66474dd7187d4d940c0f916
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to a PDF hosted on a compromised WordPress site, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://bscartridge.com/pic/79503968476.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087884b463cc---72904690563.pdfIn PDF document text
    • https://ewt.cz/res/file/88692160628.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f1815ab7d---juvibiterurosumas.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/71325765286.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/04b00101639278c6d77e8d83a4543b96/tobipikir.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a8598aa0---53687320278.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4g0a6ujkaqqvtcjplclssosmf5/38734153919.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/mabimurovipexirugilolu.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/47259801825.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/990d08d3e2a7d77a68e5bb6baffc7b45/89750662311.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c33846de98a55a4f295f9cb37848800/28214164783.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb55694e0---bumowagob.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074654b6d9c1---sizij.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098749fabea4---9192940030.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/65898748941.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210530105934.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fisekinexosagukago.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ccaa4327e---kiwiragafokaremuk.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/bedinutarebeki.pdfIn PDF document text
    • https://shidoremicrosys.com/media/nurimozanobezusotasojegun.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/76517486450.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d38eb1d8606---5001730747.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04791b497---49927723735.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/ruzuw.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/15279193487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+de+matematicas+de+segundo+grado+de+telesecundaria+con+respuestasPDF 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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 17236 bytes
SHA-256: efec36cf04a3e4dac13b28109261221124a7c7736b9413de9f259f33f89cd2ef
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 11052 bytes
SHA-256: 11b5c37a454c9188f66fe32e347ceaed0fd36049b78da2d0442eef75a87ccd68

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