Malicious PDF — malware analysis report

Static analysis result for SHA-256 1885124988e6403e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 04:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1eacb0ae44124b3ad6db7b0f2bcdd458 SHA-1: 39055ec5e09166ece163f0199823b7c8252cde89 SHA-256: 1885124988e6403e4a33cbe9f730d50ff41cc1bba24285d666e02d0ac01f3adc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://amadesafar.ir/basefile/amadesafarir/files/53959680277.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66772eeb3---9355594692.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/zonomifiletotomuworu.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nakarusakebezopomixi.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/89984827959.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sigirafomaxos.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/27024446843.pdfIn PDF document text
    • http://landpas.pl/upload/file/7646247400.pdfIn PDF document text
    • http://hrudolf.com/userfiles/45532868311.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9489901c5---94009573928.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132da54ad4ea---lumefezuzokenasusudimomes.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c03aa55a---47998979032.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/vasavidopazowofexulizun.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e1cb1f25---remotizivulojetifalamani.pdfIn PDF document text
    • https://htchninc.com/d/files/96177940102.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/dusemazejapobowoxosotutu.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/94150901991.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/zipijogi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613165e6b02dd---lavusitenosasane.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/79478625796.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/55976732673.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/likegur.pdfIn PDF document text
    • https://doitoutdoorz.com/file/MXz5ghTtGkrQ0kwL.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=battle+cats+platinum+tickets+hackPDF 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_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 18804 bytes
SHA-256: 5eb250b838c5c0211f00dcadb7936d599288cc847cfe52e894899842bb8f2e5b
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10664 bytes
SHA-256: ea0d107355367d4c3bcd056b3f428b1e9918cb6efed46e6329753ee2e9d3fca5
font_02_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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