Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7d274b6107735c…

MALICIOUS

PDF

120.0 KB Created: 2021-06-19 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e393720abc10b6128e4fc7b4c88eb60b SHA-1: 13988d73af093821cdc8e6302280129b5ca8208e SHA-256: ec7d274b6107735c4819ae10b4c8225ce51b6f3645f6471f4aa9efee528ca718
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/fdc12ae04d58c5be5f03f0b864ffeabd/2712287538.pdf In PDF document text
    • https://matskaren.se/anvandarbilder/203/files/vedetobasuwatatopa.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/suwipanufawuk.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/84753778d5673d1e5bd910d148685040/nuzijudegimotilusato.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/vowonoji.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u66egjgae91265f2rmnrb5d986/vafokitumerubejazapot.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vj5k3ibosv9k5nij58daglpp8c/66795639134.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09549defd---lufusuwu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9np13fjtq02gm7asnalu2ggn07/24514337575.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/69bd259b7cb3c23c647bdfb0b3eebb21/57063306260.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7b3369c3---70351826920.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1a693de1---53125952503.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vanin.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/88617296189.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0547d21d6---26049874248.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed1f7972a6---91402393083.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1289544325---31743851030.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/025e2b3c9ab43e803e2f131191300f65/jatigabowozobaso.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bihar+board+10th+dummy+admit+card+2021+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00018d85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18D85 18040 bytes
SHA-256: 033ef3cc64f62da3a8d677cc068014051279d680f1c44549ec9cda6b920f7347
font_00_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 5708 bytes
SHA-256: 4ac095b88b7237a7697db69052d8f16a4ecc72537a44842d273f3a89ddd1dd2e
font_01_sfnt_off00013538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13538 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00014094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14094 5684 bytes
SHA-256: 43d594362b8e21592f89d73ac26eeeeaa5e48b57a24dc4143b93a8973f25f615
font_03_sfnt_off00015036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15036 11100 bytes
SHA-256: 3e888c4a90f50b757b2f15a167d06206e6c0bc011ab1a19e6e08634f8083e641
font_04_sfnt_off00017618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17618 16696 bytes
SHA-256: 94499a04fb26487dfcb9e0242d4f22edd73726112b24034f4d1ec14dcb9194e8
font_06_sfnt_off0001c130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C130 6112 bytes
SHA-256: e267c248b2ce7d27eaa74a59b52ce6f4972f93190f10c30d49c64bd6f7ff2e94