Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf87ab8bfeb3f0d6…

MALICIOUS

PDF

109.2 KB Created: 2021-07-16 02:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: badef4c8941c565720aef1de7523cce6 SHA-1: ebd768eef77e84cdbf3b5f6b736fbc3f582ff7f7 SHA-256: cf87ab8bfeb3f0d6b57152d41cde9088b946d8fe8795e97ab13d8b097b1b72c8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://butchercurnow.com/img/shop//contents/7383247736.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db00f43a002.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6d173557ec8f4ff3a7aaa7455cbd918a/41680509788.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/35352105657.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0c361578f07c9ea4504fa52c5013a11f/vuderatu.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/45803569790.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd65467a1---butujalalefokot.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d9f4df5067cf9df07bbbb43c34a20b1e/nujezowa.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ef3436bc---11007345908.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1fdd104ab5e3ab56189464ce35536aff/fisexikaferevevilor.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0f5de4fb---26661472977.pdfIn PDF document text
    • https://lasanisports.com/files/zevopik.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e2b4fa7ed50bcbf6b6538e69cded81e5/wopelula.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd42ba363---woxob.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ab8098127e25e88b0bd6ba5a55894136/53889858802.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/oogpuiprlghd5hj92t1c8r2gno/jazilokeraruv.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/penokeve.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jr0k2eools1trvcukdo2ch3165/vabadetabubuwilesarato.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d5fc74b5---51319851510.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/5619820345.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/682735927ef9526bcded8cb96d729203/nupujel.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gvkon6dv92b4v9mb4d61ffdvvc/xatobejek.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xupuzun.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7df92a90---75489000545.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/a9963d06c943b5948f1015d5816ef6ff/fupiwuj.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8c1eb58a---jukuvizexepanoxugawof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rhonda+byrne+quotes+on+moneyPDF 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_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 18372 bytes
SHA-256: 9f9ec168eaf268754e7867336b7e39c999dc8f39c17b3372d947c9c81025fa53
font_01_sfnt_off00015c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001744f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1744F 17368 bytes
SHA-256: 597df6bada935255cad37a5385dab4081dcc6a79c625a6b1049487ddd4d22501
font_03_sfnt_off00018e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E07 10920 bytes
SHA-256: 5b26d177f1f415db84f9e6d7b99f729cdadc271b0d596adc103c7778270f2845

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