Malicious PDF — malware analysis report

Static analysis result for SHA-256 13adb7afa90cbf78…

MALICIOUS

PDF

87.0 KB Created: 2021-09-22 09:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 324c6914449f4fe8285f7d2b6836883a SHA-1: 69d4175e4d345d4035f3e033a1d82830f1fb63d4 SHA-256: 13adb7afa90cbf7896abf72f4e948d6edd278f7bd295240bfb9302847b078759
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an effort to obscure the final malicious destination. The presence of urgency and callback lures further supports a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rigosarchitects.gr/userfiles/file/78368667463.pdf In PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/20638719200.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/90238043956.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/buzon.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f143325e.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/40431234392.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146f1a36d42d---35893468014.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/1631127699.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8543ea778---55136277298.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/99071421137.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/88133236675.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/43948744052.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/64a2b5ff564a36fe87148141f846ced4/55224595002.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/kevudixiwurudem.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/letatupukaxa.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/92416399543.pdfIn PDF document text
    • http://mfahk.com/upload/files/fipiwaxiwurubetif.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210915233438_aipj95.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/rorekiburariwunajukuluga.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/40617940961.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/75182846609.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/45901687928.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4cab32a0bebd99f2a21cac2550914e91/47803453807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manga+app+to+read+offlinePDF 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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 10496 bytes
SHA-256: cc5fa943bf3bf1a24c04a43bc407f8f2f54a572f9c98c82c47a27a8da49bec18
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 18960 bytes
SHA-256: dd4d8c030f8ef408e2479509ae71c51d998d150c6ea80dc17a4c9ed16efa5f34
font_02_sfnt_off0001364d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1