Malicious PDF — malware analysis report

Static analysis result for SHA-256 17812db328a2e010…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 17:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ce69127c629b9c42575cfbdcf52e48b SHA-1: 6f787a0443191fe5414c321d5148335162de746f SHA-256: 17812db328a2e010df9198a13d6abcabba22aa9efa48a7d1df7ef8195b6af017
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised Content Management Systems (CMS). The ML classifier strongly indicated maliciousness. The presence of numerous links on potentially disposable or compromised hosting suggests a link farm designed to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb8b6741ad---zetubiwibepetuze.pdf In PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/zujewalazinenililinagexe.pdfIn PDF document text
    • http://jaika.in/images/documents/files/zanolijemosuxipej.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/54213730836.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7b3b4a0b---popuzepuguse.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kijudutibulena.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210827080243.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2d752044---dizexovobitupiwekupotono.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0bbe7384b8cd30063d15993c95745532/buziwufanonatapimozapekal.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/714df6778b08e8788eae39645dda02f4/xabet.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/nefevexenizejidorafomibe.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/55798941082.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/67e92d7885391dd68bc15ac4c12a32a9/lotiza.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/79770473587.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b0c859c34ed3ea9b3d2945615f49a7b0/zusosedivabube.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610251792318f---mijugoga.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/tinegerozubewid.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4332134da500455b1d60380a1f54b990/83554155352.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lomaj.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/96375599651.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/popobo.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/norud.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/fidimedabanenamuxazefese.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/nefesume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=i+want+to+play+subway+surfers+onlinePDF 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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10744 bytes
SHA-256: f0ab38cdc98629e7d92862c3bf43176b09f5d5a3d78e8d0fa6548c477376000c
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 18200 bytes
SHA-256: e78308292fab3540a7dde8ba631f096e3b9fa347553cf9a7da1deb4eeb9bdee2

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