Malicious PDF — malware analysis report

Static analysis result for SHA-256 145ca718faa80748…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 14:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd2564b890ca3aeb1b8660f913eb3e3f SHA-1: 41ef7908eeaa5cb419be40025dc1b439865d0a5a SHA-256: 145ca718faa80748cc422d069b33daff5a9da83442c135952708e0c54cbd189b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mh5p7id742eakgtdhne9oe9257/60213914417.pdf In PDF document text
    • https://ka-base.no/images_content/file/15556881374.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8c4898c88bcc8392cde243797d9a1c61/wulesowuzasederurogulebu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6ff68787---57289891299.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dazup.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/46944388422.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/98855971860.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/lavifo.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zuxepinatorademepawuputir.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/ginezokurasek.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/31246957942.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092784db81e2---gavomakexevaviv.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/navupisurosubebigu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ac0520af9f699b2e3ebddd28e9e0e67a/lobunakuwara.pdfIn PDF document text
    • http://net-marketing.hu/images/files/kunusevetepuginasud.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/figemoda.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a751119a5e5---10374133105.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/34761952472.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/75092270051.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/87599085208.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/liwezesatega.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f43e8d629e9f595ec949fa25b6d23f36/33422171136.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/14af13856f65b0d25bbc1ef739cbbad5/zevepozuwibofokoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pelicula+de+milagros+del+cielo+completaPDF 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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 18344 bytes
SHA-256: 010d7aa47d2f55247cf517177ac574a69d9f80a8d43663dea1e8d447eb7fcef2
font_01_sfnt_off00011e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 10852 bytes
SHA-256: 4a3debdd7b215c15c698270e44338bc0bbf772aa293cd4ee59c81e0b82fb7b4c
font_02_sfnt_off000136f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1