Malicious PDF — malware analysis report

Static analysis result for SHA-256 10338b753c81566f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 01:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 470324e5b96b15439c7d4d6237004306 SHA-1: a8618c105a7a5c22db5950149090b0bcb01d6cd7 SHA-256: 10338b753c81566f3eeef97d0935ee0d4c407493cd6172437100abd11f10df7b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of compromised hosting links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6f235160---87185381162.pdf In PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/xosefalomulanugojiwobilit.pdfIn PDF document text
    • http://camwater.org/media/files/90031105393.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kgmpjmu8rpsup0k10dr2foamuj/52617217335.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b8c2ebc60c18829a9336601436c434b3/9086536007.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077b517d8839---befaxirigiriguxavetej.pdfIn PDF document text
    • http://halaljones.com/uploads/files/88023301691.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/57910459492.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/rifeguvaligobatadirovoke.pdfIn PDF document text
    • http://neteyes.eu/editor_up/30023716511.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/35907118468.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zasatazuloxevitikeza.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/nalafunebowaduwuwib.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c6dce6f3bea9d8ec469cc8b84bff1655/temimubakopivogajasus.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/25979360636.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/71953075289.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e92742e20---63203596115.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/o3aujmcrbgd2j7sudef7kc8fo4/baneredax.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/52142710887.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a9509a6ff59d01d4783f0c7b754ac863/84945920115.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/blot1q2j7gp6ohor64eatlb384/mezigubiwekowatidajex.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/7587327682.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/27542791962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=world+of+warships+convert+xpPDF 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_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10964 bytes
SHA-256: 8e4f790aaa644c273291f0cf6c796be14346a758e84099f69bad0256a108cac3
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 18892 bytes
SHA-256: 0d8409e06619c8100c5a5e58d74436a38fdc2b6d92a858ff5238af124359ce6b

Open this report in the interactive analyzer, or submit your own file for analysis.