Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4868e6ddc2950b4…

MALICIOUS

PDF

79.1 KB Created: 2021-08-26 01:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b914d0ee93a5d2071fc75e51c8e69811 SHA-1: 687c49cf1922cbd595359c785eedca6b863ede90 SHA-256: d4868e6ddc2950b41b2f1700d5eb8619d0cd5f9c6394f398166504d3af4db0d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pnq7rret1kg0q7br1pggthorm7/61376465241.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/geviloletegojovepawi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16108fcc5a356c---defunozow.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/69864748316.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gujalikafatigosagilixa.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/77766389328.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zavozapesirexejiviwisexan.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210730_002610.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/jipogukapoxegagapevena.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/74333878389.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710170041804874.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/lopejuteketozeledazusi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7295d071f8---balisovin.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/91108284638.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210613221754.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780a9ae1652---wafuwuzezufunemeguvuk.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c7bd2fb538ac26ee733e7064e07f2fe7/polidalanuzowuxedu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081caf0197a7---fowevadilasanujugom.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae25b09b0c---zefipixavenumomovaviwene.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k8nj54u1ppgstqi8b9cij3qg6j/16442658941.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141d89736b---terikeluxuz.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/romogavolemurabog.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d252f501e3---64727774704.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/87854137063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=design+of+trapezoidal+footingPDF 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 10732 bytes
SHA-256: dacbf9fb67f51c74a1538856c93383cf67002a8d8249b6e93cdf54fe20fc5732
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 15840 bytes
SHA-256: ebc8bc811962d8e9eb29cb550821d514efbbe63d7c6a13617493158d93ae6e00