Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f03df1b5606d1b8…

MALICIOUS

PDF

93.9 KB Created: 2021-07-02 05:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f00f2df092e88baf84612bceded1954 SHA-1: 8ed0d7c5f69bf953c5a0be62b487962f0d0feda5 SHA-256: 6f03df1b5606d1b8e98f5677acc3620118c0e8a2eeef99185947966e1e1ca3c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89d250e430---jawonatowuzipef.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/33726854301.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/91eb3ebfaeb60e3dce8876ab352e6b42/fitafanovonamaropofuw.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a584253d9f---28812877452.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b1d27db8---37514224122.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/92077774137.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/p8ft1vfjbigsim3dbmui6b09b1/lexelu.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/8328949242.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ad5ed8fd5f4f0e4a479f07eff3b4014/xunalalane.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/34459929477.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/019b33f5ceb0881e1da85bb44c4475fc/vixupufikaxoxomo.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/50313278316.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/japimebul.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/8742289766.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da73685f13---pevax.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160736fb7dad5c---24628436076.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/degekokusazetexi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/xurolesomumatuxo.pdfIn PDF document text
    • http://sro52.ru/uploads/files/48123268471.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62fca4a9d1---xakasoxutajemuwozujaloz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609963285a11f---52871250977.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/362ae0a3164d8f8b489acf99c1255bd5/wexuke.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xoxaguzuxuvowetezorusuf.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/12267206519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=resident+aliens+meaningPDF 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_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 10416 bytes
SHA-256: 82dddca7816743fb2b8984e9cdf6c52582cbe7a0b8b165820e2fdaef9c3aa883
font_02_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 17892 bytes
SHA-256: 9aee5b16c0cca00886ce67c98a7ca4d7bc7322c26b4d9c79de5b8d956953570b

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