Malicious PDF — malware analysis report

Static analysis result for SHA-256 af01b38ea1f9583d…

MALICIOUS

PDF

81.4 KB Created: 2021-08-16 22:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8071923a8ac3e42c883919cce43b580 SHA-1: 09d622eb25a180a3633d69960cfbcbfd9b7b6426 SHA-256: af01b38ea1f9583db503ff1d3be2c7ec6615946c6402217b91af8be0143d359c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document is designed to trick the user into interacting with malicious links or potentially making a callback, consistent with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=giraffes+can%27t+dance+pdf PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4aab612ebf---32752172087.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/c3l5kgnhjov088c5s6i98l0tc5/69996138559.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c794494e61---letitulefomalanujajedalew.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/15350599197.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/levezoxewisupotumimirix.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/dotetureruzasen.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/kisunuwelekeduwafev.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e894ff0---dukoboxosibelil.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tixupin.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/delibibewir.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/32618811814.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/8909517918.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/99741942692.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2b233f1a5bb82b6af6852d09ffec0fa5/23768693635.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/razonifurexex.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074aca653fc8---52422476304.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/mugevojupasatosotij.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/29268366390.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/15101524677.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/70sladlbt82976regp6k6bj6t0/27323972288.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/najup.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db44405c95---busug.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/62806188925.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a66fb8709---35765893794.pdfIn PDF document text
    • 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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10520 bytes
SHA-256: 85cc8ff4788d7d14604dc6877ada8bf393f53dcf548e807932f507ecba886559
font_02_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 16952 bytes
SHA-256: fcfefecdebf47d91c0551d4c6767a9f1209ba616a0f96b55a7a6fb386fdc5cc7

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