Malicious PDF — malware analysis report

Static analysis result for SHA-256 276ca6238a6589f9…

MALICIOUS

PDF

73.0 KB Created: 2021-06-29 12:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3db114e57e7142f6eba2f0d327e58fea SHA-1: 36438b9d7546c60a2315bf5b6ef8b852f19392d0 SHA-256: 276ca6238a6589f99d10b18ea1dd289a1cf7707f3867b6b8a88f3a2b87b70e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007. The primary attack vector is likely spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160859f8d94e0b---80481005627.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/natqt942tj30mndoscqfba7fe1/10390108910.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/leteri.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/49245216845.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/g9btm8v683l350ovp5i4lhfro0/kulik.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jutowibiwa.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/71439274856.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6db32ac9d1783b0f4bdcf597031a3ee0/verabobesidefix.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/23eec2a8c81af7d8be3fb4776a9868e9/nireparukoviva.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fijowowofudarewatasisug.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/btlu3f2s3b4tr86346hbt1c635/teladolowuzokejevoraxovut.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/78783024806.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jedajopuzatirizix.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jipazidebok.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a32147968---filoluritulasegopipedonex.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1mpop9l31cnf20lfl59l95utha/46909297697.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b9971e6ac41---megelofolemaful.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/60eb461ffd55f78c7d346dff3a250799/zovana.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/toloj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1t3l6us78aq72j90hr466hi212/49836770500.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b9d0dc993e097bd42447a2df5eb60355/fonavizoxenakamulekikimu.pdfIn PDF document text
    • http://elm3rad.com/file/katubegozogexeko.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/sujil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=area+of+triangle+by+heron%27s+formulaPDF 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_off0000ba28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 16448 bytes
SHA-256: a3bd6c19ef756eb86c11f24a357a837b3ef2a41ba3496504d880d73e9298fecf
font_01_sfnt_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 11032 bytes
SHA-256: 141c1b19049a079ec47a8dd9e9c0657227680d84bdc6761c70149682177b662b
font_02_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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