Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccefaa7c840839e4…

MALICIOUS

PDF

89.2 KB Created: 2021-08-14 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d67dfd9386214183aa78f3b2b8062f0 SHA-1: b2c8a615966607da2436ba765b70a4953d9c6fd3 SHA-256: ccefaa7c840839e42057964e3161895209962b746e2ae5c446b0d9072e4391c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by numerous embedded links pointing to potentially compromised websites and a visual download button. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the presence of external links and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=teaching+by+principles+4th+edition PDF link annotation
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/09a06bb0b82837afe9102031e84df3f5/69686611456.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/70957189717.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/15105401742.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/81348825702.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f06c8d2abde---gikolaboro.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d5636685---gepasatolovitutomaw.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/nimitulumapadebaporeditu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0ef6d0dd78c72f99c42cf8a01f84cfc4/domeraxekew.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fcb29ba5a9a527e1a7101c1d4845e211/woguwomufudogu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071b60f65ce6---33443386381.pdfIn PDF document text
    • https://fallsplat.se/file/pelizagu.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/52043235554.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/71418482564.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/labajef.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074344923f48---wazijalu.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/91883058363.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/1797952512.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/rojamuxufevipipita.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05bb8b9720---nafopevoz.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zazukafe.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116edbdb102f---94368145648.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zalibomixakulawafiloveba.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sq97q05726lluppvai2042ib65/46669910543.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/74252933713.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000f5f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5F5 17632 bytes
SHA-256: 6ee3998727ba9056b7dc15f84bbc4d334462170106468421069dd45fd706625c
font_00_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 11088 bytes
SHA-256: dcdc34a4072acb74c736de34792da13bab8728cf9c287cb04037b961fe71f20b
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16984 bytes
SHA-256: a9d9ab94446c9525d44b85b98e1320d49e22f841fb2dea60672b21822ea14093
font_03_sfnt_off00013dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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