Malicious PDF — malware analysis report

Static analysis result for SHA-256 312155479a569765…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 20:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa5db2f3877019cb34026c39ef693999 SHA-1: 6cafc2472ec56513b0a2d39a4df4bac8abc6cc60 SHA-256: 312155479a569765a2e9073dc228653bdfdb94cdfcfe10fdeea59d78497fc3b8
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4596

Heuristics 5

  • 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
  • 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://jurad.eu/files/file/14176038247.pdf In PDF document text
    • http://eminenceinc.com/userfiles/file/63007731190.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1d51294f719d2c640ba73f59d463f52b/rewudo.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/kotiwimuxakoretobakijepir.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-2/20210902205651457130.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/keluzezeda.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/wejiw.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45264d36---getomazus.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/pepegeguvul.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/datemijazukifezomafoweras.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/11348658877.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/xipejujagisemuzu.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/78632647674.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/ketamemupogalokekisika.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/dejiguxa.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/83870421749.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16141d16711aed---43286857846.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/mazawabiwatonuwafazefu.pdfIn PDF document text
    • http://hidropro.hu/upload/fukakasozudewoja.pdfIn PDF document text
    • http://acelybio.com/upload/files/damebez.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/biketomanes.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/vosapurikuk.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f5bcd45bc1100bb9b6780bbba58eb1a6/dekuwijafisulonuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+share+my+mobile+screen+to+another+mobilePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 10828 bytes
SHA-256: 146878a228eb610c5220130c84e5f99d2f619abf23015e969dcfff8b16233755
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1