Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3da91b36466fae…

MALICIOUS

PDF

99.9 KB Created: 2021-10-31 17:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a522cace94b56352087b1ff2bc5b4e4 SHA-1: 6e17d2a438affd893a9a7527775c5b8f18a9de90 SHA-256: 7b3da91b36466faeda3316a8502b0470d01da2f2c5d9e5ddaa92320aa85458bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a77aa74d1e6bf6a0f62e2d853da6e09e/85965349241.pdf In PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/wovifamerorefavesite.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1617e54ad4bba7---rugepoto.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/tebopurir.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/vifejaged.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/71078867643.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/gegigigugadimeni.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16173dc2c6d9c7---xuzifujirifixub.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/30875607700.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/1933308023.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/pobatir.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/97163813547.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/11233529653.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/dagirogekok.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130113e3d603---nelibixalewiwerax.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/23184038912.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/962659758.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/bajibuzeje.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/wurara.pdfIn PDF document text
    • http://grabnerestriche.at/46545439442.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/soleruwizukukuxilubud.pdfIn PDF document text
    • https://3territoires.kopro.fr/userfiles/file/17249043752.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/jibulokodoruxinolixo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1617a2aaedf5d2---95383777507.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/vesosa.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/rutiguzilises.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021092623131773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=the+capital+of+the+byzantine+empire+wasPDF 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_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A3 18128 bytes
SHA-256: 8604015e121bb3cffcaa8f71422675010c18fe1a669b277209ac120a686b0afb
font_02_sfnt_off00016872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16872 11108 bytes
SHA-256: f70defdc1a57d7fd486aa188c5ae652de655f339c6dee61d2bbe1c78520fa023

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