Malicious PDF — malware analysis report

Static analysis result for SHA-256 20893baf2f79761a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 01:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d009ab77c7047ef0e9cae4e7840fff9 SHA-1: 964b43a6115b29111f35f6b070db4742dc4ff4a4 SHA-256: 20893baf2f79761a929b60db1dc2e50b5a885249752fc4b822b0aa48189af89d
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 contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the execution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://monamifrance.com/FileData/ckfinder/files/20210725_C7367EFFEFDEEBAC.pdf In PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/94514217192.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/3089132558.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/35527174375.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c289a0faa---43356739179.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/fameposudot.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e985157c92---foroselewinexetunada.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48891ed98---xuxumaxukulusizob.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611541750d2ba---megudug.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e6db970d79f3b22db6051e39d9b976d9/21749407001.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/busexuzenuwuxumib.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607955e4e9e24---ziligudeme.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/54986143566.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/89961366350.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/wusijuxakelido.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e90c5db1---xitepuzi.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/76322965555.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160713dc5bb8dc---bidevawavuvodufelo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/19804260842.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd48329aa11---wonogurazugajekezarika.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/wojexipaje.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/oo5fmlomu4imqbs5v9elkpavkc/kesanija.pdfIn PDF document text
    • https://agermag.ro/mm/file/97978163605.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/19259632511.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab0ed593f---36361453576.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/lurarizimokuwumup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=search+ration+card+details+by+namePDF 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_off0000c2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A6 15704 bytes
SHA-256: 5f253220e4d83a6e230ec1513fd2da9ebc7dd05277582fb46967dfbb4cc812cc
font_01_sfnt_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 10964 bytes
SHA-256: ff0b557081adb541337f40c4901ff327392c777d383f5c1644a70c5a83599be0
font_02_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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