Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecf7948d8f282e6…

MALICIOUS

PDF

148.4 KB Created: 2021-06-30 23:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5381c1c91df1db5af103ef6bb06980f SHA-1: e4c104036912e04472482bbc4f9e71310df0fde5 SHA-256: 7ecf7948d8f282e6b57e3eef493ddca24d2ff68dcaf0f0390921d6866fcefdc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://inwebjor.ru/uplcv?utm_term=class+9+book+of+english PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd8b50316---tujuluzira.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/zatoj.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/7445235191.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afd102cb4ef---wawowolubusa.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/vedatewixodejifaxoxebuga.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/zunidegitelufuwa.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/69045114667.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/bejugilufum.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160737189588fa---295000581.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28193d10a4---33134340063.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/64b5a4954ce450727947f3f3fa8a7e43/30543162578.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/tatilasesagagajasated.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/dua2u8r9os9jkjvdbdufb85cim/kabazofajegopulovomoduw.pdfIn PDF document text
    • https://etadelloro.it/images/file/52849518627.pdfIn PDF document text
    • https://autoparkalbanese.it/file/4835829311.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62c838d7f---zukaxazagipexowazavuvimol.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160834162a5376---doxivuwufuvolusexo.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/bopukipiposivizolitab.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/209d18859c5edd02f5bda844029a3a6c/nadefogebifikixa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3cc5597105e1476433c761d360bb8caf/manefab.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/91274052747.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/1e6674cb8eb5a0200944f39021e71b64/88504246974.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9g0rfv79fm1lc1257c8rd3cca8/kunurot.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fakexagekupud.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0149208483e51ba41d36c97b29ccac5c/13471301578.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C961 17076 bytes
SHA-256: 71ba490acb55e0ec4cf69e27a47039b3e1fe4fbe3c88382e82a3b08ef9861f7d
font_01_sfnt_off0001e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8DD 19596 bytes
SHA-256: b190bd512aa5485e41f15fe43fc12e401c48c9fffee1b836660d51bb92fe607d
font_03_sfnt_off00022ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AE6 10728 bytes
SHA-256: b9d8d410fdf84fb3adf557555e71997e2f353133125ac34948e21bf5c79d79db

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