Malicious PDF — malware analysis report

Static analysis result for SHA-256 016ee5bd5c6921dd…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 03:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a027720341e00e62589bba11018bcdf0 SHA-1: 5692d55e55adae2128bde77e8bcdcee4b539b1ff SHA-256: 016ee5bd5c6921dd3b8910af17238cf400f2c2f741d1995cf7631211ea45e49c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

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://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/68540283902.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520130930531131.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160715bf37431c---77122998933.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/28514175181.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4995b5b0---lesezevuwiponive.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/a80f687c5a426fcb726daa1bc8130a0b/36590190097.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/3c5889u88miair5nqdl0joo114/76877562536.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/97715127846.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160771bcfc5368---kopelalisekexodol.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/64026452650.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8cd881d7c29bfa5bf7807ae4d6a8c821/60020491537.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/99711449074.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/lorikosodub.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/doroge.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-6/file/2021060315290873499.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/83176321275.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94f69fff2---gezaxumobadetugonuj.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/aca1ee6ae514f08b0005bc5cd108a558/43921112788.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/475g70dhdso9ifd2ebkuv8ao7m/12924133336.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/lofalax.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/rixosuramakobosa.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/powajefulaminolob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c90f76a19---36153414865.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d0fb9ddb189519c989dc32c7f8ea0030/vanafazewupobodew.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///52223787435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mdi+to+pdf+converter+software+free+downloadPDF 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_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 17032 bytes
SHA-256: 73d81f6e40be5a9507ee42a1cc0d8c5b360d79d705794760b4b35b36ca6fa261
font_02_sfnt_off00014092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 10760 bytes
SHA-256: 05329b5add40f9bed6dd93c55a68592c9c25eba44177cd3761f98d26d76de7b0

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