Malicious PDF — malware analysis report

Static analysis result for SHA-256 176e56862a23ec3b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 19:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd57f89f630f41dd02e15e43c5526676 SHA-1: 8e2e345930477119b4144be46d2fa1d393970fe6 SHA-256: 176e56862a23ec3b42d271aaeaed157c336aa66ba67ddf5c4ce5f892e14dd821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file acts as a link farm, directing users to potentially harmful content hosted on compromised CMS upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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 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://m2m2design.com/userfiles/koxubazedi.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac855e31e9---rinibutasixunidixofelokuz.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6af9e26fff938978b5f778d5f16020e8/mixab.pdfIn PDF document text
    • http://apvn.info/userfiles/file/14192781433.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/xomilubogamej.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/89524260218.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3fddc64312c32dfb725b8b4a4eaccadd/rejoxurofirubozipu.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/7589167089.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/92773810760.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160870e46719e9---zakaxe.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fuvegufavuruz.pdfIn PDF document text
    • http://dnepropress.net/files/file/giwavusixegufad.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3gbt0gfrbs7708l9ire784mqh/temefusurofabak.pdfIn PDF document text
    • http://classtool.info/upload/files/zedaxefevugab.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/5g4shjpk6glkap5n4s6ngfrvt3/mepatapudubasex.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb5b9048f---widupomubolav.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/vodomusomete.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/43662579341.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/riwomulapox.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/44306538965.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612941ad51935---libivomodanupawarate.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/oimvc2ltftv09e6cmrci4s3l3a/47023149795.pdfIn PDF document text
    • http://kgmda.com/upload/files/livomifimepodema.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gamugasuje.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/70760207413.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d45ec105a55704a701256b81098c7d56/junavugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=thesis+tungkol+sa+makabagong+teknolohiya+pdfPDF 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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 18548 bytes
SHA-256: f78e5324282dba54f255671e82720754710979d812f5cf038cc3c6b96a576c30
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 11252 bytes
SHA-256: a46132c0fbfb383248db04455f5b5416806b61fe18a2b49c25876e1dfe1ecdc9