Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdbf806524bb704…

MALICIOUS

PDF

93.9 KB Created: 2021-09-05 23:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6c379432c1d0e94f5cd995c1f8670c8 SHA-1: 30b023fb107b2fb3ab31fd8a0b219574a80f8a3b SHA-256: 6fdbf806524bb70428b019eaa1e39f5430ae8313f954dc0514669d87530f325c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious link farming practices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://mysistermyfriendministries.org/clients/85776/File/67153964383.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/20210630/210630103409139248gcup4h75jc5p.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/32190127433.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/232udsrk74er0umnloimgvud1u/90987219686.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/73472850100.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3568b3230be8ecd83f0d7986209ed424/78816243013.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/juninumogevefizilefozak.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/71870047249.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/29950384648.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lefivumolafatogagi.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/rebebexu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114cf9bc090b---97609219582.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/42417988151.pdfIn PDF document text
    • http://grimastone.ru/files/74712852975.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobujumon.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38e1cbd0f---5269703217.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/kenimefu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jiha0gbjvhslfitr1q2jhk7sbp/lopidotodavusuzut.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a799465ed---vojirigelozusizo.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ziwuxovafasovusezoro.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210813085137243.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/62990588502.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085359c04149---japanomolanepozupasikon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sound+waves+worksheet+high+schoolPDF 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_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 18668 bytes
SHA-256: 3d142f339c711329aa3b6938b197ac7b9b5aa82f213dc4a2e9ae84d16876aafe
font_01_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001501c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501C 11068 bytes
SHA-256: 81830c059bdb72e7a9b0f811c63d3264c0a7c1fd5ae6bdd325015dafce3f4a68

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