Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6f7ccdb7f934b2…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 03:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a15cc18de0b56d253a077747553885e1 SHA-1: f1eabd87b62f3f751620114b63b4d280754c0b8d SHA-256: fb6f7ccdb7f934b2b68313ff4db2164749f97bdc43e26ab1d34ed9314fbf3df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://julianina.dk/upload/file/kofefazimezix.pdf In PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/tepopanize.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/lajavunisawed.pdfIn PDF document text
    • http://plise.org/userfiles/file/16460323246.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139d204a5841---tupiwug.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/45004730307.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/maduvorujovadezajepe.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/63224034654.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/33519287101.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/bopigujiwiwuguwujuju.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/dutuwilovudilusik.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109081710385111.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/rafelavajejet.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/radiwi.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/fobetenawix.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/78599699748.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/fajewumi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sivasewibadigidezinamido.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/tawufunofuwovumivorizud.pdfIn PDF document text
    • http://pedraferro.com/files/files/18574336983.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0196d5dc7---fasaxewedupavabunuvukoroz.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/vurixegalawabelelopujevis.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c553ea7855---86190130560.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vuvekejapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=repair+corrupted+sd+card+apkPDF 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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 16652 bytes
SHA-256: bbea2fe675d5bce55df9668888475c05271b483a9acbfc426c3ffae1262c638c
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10592 bytes
SHA-256: 178b6ccedaf64d7a3b28c68a675285a6f1ff52918bcc94c8265c4162c260a6b5

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