Malicious PDF — malware analysis report

Static analysis result for SHA-256 2740ba4c32d8608a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 01:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ed52767a734eb8d721d79b88c285c85 SHA-1: 39e55663a406f3171d9b76fe522e22f3d23c8089 SHA-256: 2740ba4c32d8608a08c01c8f90304a437a3326f4b9eafe8f8ba41eef182ebcf7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://francescasciortino.it/userfiles/files/43680547144.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca02add22d---wutawavituretoju.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2ec752422d3b1cab24aca60d0cab6941/95377291259.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4cm1pl9m8td9204qlhdvsrsicf/vusemu.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/meburijowujutezekawedoz.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/17520541559.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/9552126765.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/13044510579.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nuborefijoveve.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/dikapogosa.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/mituwesetonupalabobep.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/akfkiq1m7jc3604q73n2fu2kl1/43681733302.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/77778978916.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3e5883c7---8899827257.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/81857094958.pdfIn PDF document text
    • https://photojet.net/userfiles/file/92411427826.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d68557ad5---52267609615.pdfIn PDF document text
    • https://rjpexport.com/files/19223512731.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/65722598178.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e68969de2832f33525bd05ff0af1bec/76440110008.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef74ad6f17---lotuzafovugepufojekuxiwet.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fowanodivimanovajufile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+long+do+you+boil+and+eggPDF 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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 17884 bytes
SHA-256: f69d48fb11885c16f2a88e371f08b72eec7116f1f5ae8283c2be307a786cdc93
font_01_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 10488 bytes
SHA-256: d522b2e8b7554e01b09861d5914106ea16dd40ea816af853d51f41b782f19f6f

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