Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8b0e25bbe37ce0…

MALICIOUS

PDF

85.5 KB Created: 2021-07-17 21:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de1265e8177b760ee62c63cd39d80734 SHA-1: 7f813e5be846d8dfc668dad673367e5a5775a657 SHA-256: bf8b0e25bbe37ce075d22087e849550cf96c21699e90e78244294d7f29450685
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, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and the structure of the PDF as a link farm support the conclusion that this file is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb62398a9c---lalesexugo.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16073989f3bbdc---74544172452.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/88456041915.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1d4728838e8d2b22e3ab5744e2548f02/28843375385.pdfIn PDF document text
    • https://unosms.us/userfiles/file/99435842204.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1251c7f5---28765792460.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nedisitufosaboweziv.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073165d4f941---zupuxatokukusa.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210530084629_399625592.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e15f3b49280ee763cf216cb1467b58df/remerotetawigoji.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6s9isu8t34oob1qr167ben6v40/fadosuvivinawozeve.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607155d1bed19---67873275696.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/lfv6hbvtjqccll03u5nttg4m34/57444996772.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kuzozotaw.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f5b015a016ac4527e92bb782a0e1dd2b/mefak.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85ea7c1761---fanupo.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/dogewadoxixoperomir.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/76494894651.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609656f5bf63c---levipakonov.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e10f9f72f---wejebepalisafadonuremije.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/sekamosexesagazubumiz.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a312c4fe2---71677541728.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/14159842408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=topic+my+favourite+animalPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_01_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 10716 bytes
SHA-256: efb775a37e0fb5fefaee9f23954ce60fb990fe3a949458285a77e3ae4224a533
font_03_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 17252 bytes
SHA-256: 49c0a9a91f4f978d157216fb9efff882e2a4bfa131769d35221c327a259a1c26

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