Malicious PDF — malware analysis report

Static analysis result for SHA-256 51af7f1fc802473e…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 04:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea5f998b94c7ef57097a85a882111e06 SHA-1: f79c44b0adee181f8ee6b760de32e563107272ca SHA-256: 51af7f1fc802473ec5989a16bc16a59fd9288a3e0d6d356ee4a3cdeed1ea31f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c645a268c0---losivufemazolonefiwumoru.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160807b1e0e26a---daxujigifofadowirituguwa.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/23113853896.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/31980342143.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/rujarekavapevexavuvifa.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0fef771fbf6948bd97bceee3c301e9a4/14613034382.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe612ce1a2---52387380497.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160984fc4025d2---dijadotemosesemo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ab5b4b1b---pifoxiwidepofiguz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8d7e7e387cbec46800101c7ce3e8b826/61790050900.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/70eab0d2bcdbf063177b7e219f316321/xuzidipidodizilom.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b13c01c52c26e205cc831c71879a449f/gisikonut.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ce5a91d9---38205006509.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7166284121.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jezoxirewizono.pdfIn PDF document text
    • https://naoshima-habitant.com/fezidivi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec8c9ae331---webonujesaworukesoj.pdfIn PDF document text
    • http://kleiberit.ru/files/file/xisopejok.pdfIn PDF document text
    • https://badoza.net/userfiles/file/fefovoxezokevibir.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/48914643509.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/44901707621.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a31c62e6---pekerew.pdfIn PDF document text
    • https://gangnampools.com/contents//files/51231681280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mitosis+and+meiosis+t+chartPDF 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_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 16792 bytes
SHA-256: 5f135d5a5225ffbf43fcdd4a6037220920ddc73a81975344910be9ad10fe2351
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10580 bytes
SHA-256: 7e4d4e31567c11fa2e03ad33ec23c18ae19603419323b772bc5305ce87b22efb
font_02_sfnt_off00012866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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