Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2288eafecfb307…

MALICIOUS

PDF

84.1 KB Created: 2021-10-05 05:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9d1abfef69dbe548806aea8cd3ac543d SHA-1: edb06cff51e82bb59df5df8942d5401462467d93 SHA-256: 0b2288eafecfb307a3de5cf5173b1d6fddf1f5ea179338b3d3df1ec169f82bbd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to potentially malicious sites, possibly as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://juha.be/_files/file/66260296005.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b84df070ed---gameximorufululofo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210926200148164.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/40818596758.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427cb5f17e1---6159402412.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pojamugexatekidosa.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/746574004.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161359ccc1d50e---lewegaratunesiwegelel.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/92745562083.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/28495506690.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109202246254099.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210921_D1EF630C84ACA295.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/fafefewadugekipaki.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fedajapepisazu.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/21118197288.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/86632205994.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/29056425132.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/rotusur.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/birufakekixufomibego.pdfIn PDF document text
    • https://mollis.rs/files/kajad.pdfIn PDF document text
    • https://planbmedia.hu/files/70760608031.pdfIn PDF document text
    • http://mdtrend.hu/files/file/88597184331.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/88187762105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+stretches+to+grow+tallerPDF 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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 17912 bytes
SHA-256: 80752a14bc0360b4ff27807e387d93d4bedd0f4a3f3298b3198b79236f6741c4
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 10452 bytes
SHA-256: 2939e0f84fb367ea2cf2f88441657bdff05234fa17517c5d058d5b8e31f92859