Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bfb62c7d7ca30c…

MALICIOUS

PDF

85.4 KB Created: 2021-07-22 21:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a87556f242bf11005dddbc968dc9b226 SHA-1: 75051e2f95217e756b8b11063000b38d8656f16b SHA-256: a0bfb62c7d7ca30cadd4e6bc43ceca8fa3a11bc3d7b7d45484e6f67e63ba7b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users, likely through phishing or by serving a secondary payload. No scripts were extracted, but the structure suggests it may attempt to leverage PDF vulnerabilities or redirect to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c3b4011a---pewuvedifosudev.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608522edd1851---nilonokitorewexajit.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/sizum.pdfIn PDF document text
    • https://fuoriscena.eu/file/71362822590.pdfIn PDF document text
    • http://darienhighschool1961.com/clients/6/6a/6a5b14ca9cca6c9c7811e238b5dc87af/File/fuvaf.pdfIn PDF document text
    • https://mimpidia.com/contents//files/kadopukud.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6e989821aa32234573cb1a99fbb68963/2984675409.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da21ec90c1c---nezalavixobezulewimovav.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8f9f12dadb04aebc787d11639873cb2a/47367939586.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/5345710611.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nulcmeeqs52kuk9p3tff596eid/gonudib.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lodaxaxajag.pdfIn PDF document text
    • http://ashioke.com/images/library/File/terajadijifa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5daf6a13e---fekirosazu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af6edf8ef20---sajanaduwixiviloz.pdfIn PDF document text
    • http://orthopediedelft.eu/files/jusejenu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6df03b4f42403a9ca4f13cdcfdeaf685/jafinazetut.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/88650015217.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ac0252f2---81519083843.pdfIn PDF document text
    • https://penal-garazh.ru/files/vutojagijorelub.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/wugubefemuwamodefopiwikan.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a224940d1d9---gadivek.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210606_012920.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/ligevopowotulixifudonir.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/94944466288.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/1p94uhe357b0qndb0hj6ssdb81/tosusotowolixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=determine+the+molecular+geometry+of+sf6PDF 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_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 16904 bytes
SHA-256: fc2cf9f91517e68b1b63ca447e3801371e4f65daa9f8415940b781808f8379d3
font_02_sfnt_off00012de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE5 11168 bytes
SHA-256: d92637833eb482292293da8060cc49d628f12eca5633c86803722d5be16e8829

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