Malicious PDF — malware analysis report

Static analysis result for SHA-256 9808dcde605f836f…

MALICIOUS

PDF

136.5 KB Created: 2021-07-18 23:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69082003ada618f532bc1e6136c611bf SHA-1: 202cc120e2c4703fd2d390150b831007e0fd3384 SHA-256: 9808dcde605f836fdfffafed6719e2cba02d285ba6b2eca7a4ae81b47fb0d247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting, likely to distribute further malware or phishing content. The primary attack pattern observed is the use of malicious links within the document to redirect users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93241dc72c580f8a2d60c9dca7086a8e/52349009220.pdf In PDF document text
    • https://szabobuszrendeles.hu/files/files/29435684245.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f8a98c36e7f75dd6aef40e03244edf87/29929407817.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/74913412502.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cc0844b77---vagunasebejifisedejog.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/eb1e96c96a5e6008a03d57905c7ac035/wudufawev.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/65297611179.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/79200605452.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f212fafb3ace1f995ad6ab6b494fa549/30188129656.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31926a5e5e---malazuwimaverabemidaluli.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wojosidawuzedoxexetuke.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4c322ea4---23356164529.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c4ec5ec2---mubidonezotizo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b24fb83c449bab01f305d0b3fd643068/rofujazezevutok.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5aabcf29e---32299720317.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/prjmodh96vu7a949ri48gklusm/jovibone.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/1300734182.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/vafizojegigomopote.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819e2a33111---zirejivodoruzozobi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/rof345s6r6m68ppkqll900pgbh/22181713482.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d649b6380b1---67385278619.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/1511023639.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0mhrs09bqpbral9t4cpnu0pf31/21194698884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jam+biotechnology+previous+papersPDF 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_off0001afe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7F9 19036 bytes
SHA-256: cf886579cba68527df2174c558f697d8dd6b0fb34b1e6a16290e24b7e4a1c6ed
font_02_sfnt_off0001fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA3E 11232 bytes
SHA-256: fc237f0afdf491401bd57db39c26a660c2e56d443754d617c547157cff2701fc

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