Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff6ab247d46b2b0…

MALICIOUS

PDF

334.0 KB Created: 2021-07-30 04:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 884b9139cbd7a90cb6acc4cbae7d498c SHA-1: 956db276586a76f016f6ef98d30c21ef3fdc8250 SHA-256: 2ff6ab247d46b2b03386256ce2a330fc0dfa01fc5932c71bf16460cf4b233b88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9084

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=baixar+livro+resiliencia+pdf PDF link annotation
    • http://self119.net/upload/userfiles/2021/05/files/210531012820.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f4628924a95---vimekukujekexopukujuduwox.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rmndraelmn6jssnb03jufa2lc9/pomap.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0b4fd0ef7447700f98deaf1209a071f1/xagafineziwusomom.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062413444580554.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bn1d42imtm9ubg4ovg898s6eag/xakopa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8cf05636c---lifewenadiwulaxoxam.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fe52e065---74266777434.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/35t9fg1s6rc7aim94mjbmuvdti/44114703322.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d8ea87df9a4eccef7d0fd2a6728ab8c9/57216037054.pdfIn PDF document text
    • http://abnicum.com/files/file/26377884432.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/54090939782.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/741950df04af7e019553f6714bc2bce0/xirolofuxidenevitobo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cffd8ff664e9aaca1e1ea5861e5f547c/xuvalukoleb.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773803a16b2---gesofavajalusopu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e90765b8b9d---titedebanufutuzenod.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/24846665491.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/88935087073.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e782983516---nogakanulixajiwibe.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/18038278394.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609468448d46d---44606832214.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4pse4rrs88kct5109hgrra4hs/tofutamakozezivotonuf.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/10584378582.pdfIn PDF document text
    • https://susta.vn/userfiles/file/63448234386.pdfIn PDF document text
    • http://dzbnf.com/upload/file///45575232649.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/larozopudemitek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004c14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C14C 22032 bytes
SHA-256: 223e6ec996566c57716715de6e49a0817cb25d81b0dc56935065e53ecf7b73e2
font_01_sfnt_off0004f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00050dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50DC1 10736 bytes
SHA-256: 794abd619fe998cb155a77f5341c7876e607fad7f7da601247f6d6e2c70672a4