Malicious PDF — malware analysis report

Static analysis result for SHA-256 6686728552e55d99…

MALICIOUS

PDF

91.0 KB Created: 2021-07-20 10:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4ba3327353e238fc0a91e98236825c5 SHA-1: da863a0847ed167dccdfa57b039129a325051d14 SHA-256: 6686728552e55d99a7d4c26db88a2298a303a195eeb8a0b80e80425602e8f21a
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phishing pages. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hi30i2hbh7agvkh0fggks76quc/sugibadoxelise.pdf In PDF document text
    • http://www.deopendeur.org/imgUser/file/dosebutav.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/tovovimes.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/49ed6a9fe0515de47124d9d6a3e3b9c8/xexal.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/barijufuravegap.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lonegoxatugazem.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/71b150da58088c71eb8837ad72d92943/xevaxolelotoduzejamebe.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/jisorefapadapiguponipu.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/nixixawakowowuwuziluva.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/42188684689.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/a048vkl5qoi2gbbviss00r5qsg/59673009074.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lotuvajixemi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e356c61b292ca0e64bd4fb32fbfffa7a/85426355633.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tazisuzefin.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/29650470813.pdfIn PDF document text
    • http://pinxedien.net/upload/files/bizagirodovizi.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tumodesiz.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3590534b6---jopatesuwudere.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wopefimemuxajetivi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9e8614f7---88317004265.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/28354703393.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6fd329e1---31983985612.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/ginowivikugesasefepob.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/c91ns6gvq9r1ugotgggnfrkdr4/denukuporotemenavonig.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10b9f1ed1---novamosiduwagirifuniko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ielts+speaking+sample+questions+2020PDF 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_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 11024 bytes
SHA-256: 5c7599a999f9d8443eb4be29f3af4bafea4f5ca6811eb78b49bac408a904da48
font_01_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 17176 bytes
SHA-256: 3134cb45d1bb5928d89db36cbbe7db969f752bd3dc87213ccb69ce589c456d1e
font_02_sfnt_off00014640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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