Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecb5b5baecb86d2…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 20:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e4be8f949888a897eedb1779a32ec6f SHA-1: a251e902f8570a1fa0848c48ba158ca5c2019529 SHA-256: 8ecb5b5baecb86d2707546a6e27aef6365a0ec65cd81086aadd178940a4b40ab
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as an image-only lure, a common tactic for phishing campaigns. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or downloads. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious intent to exploit user interaction, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161389baf09f4e---jubudavezegodugivuwejuma.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/jeduwis.pdf
    • http://sz-nuoyi.com/Upload/file/2021092523175962891.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/10044323826.pdf
    • http://www.ecvbrass.ch/user/web/file/sofuvemewejadajumuvu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec1f86cbe---68242466676.pdf
    • http://sergeybazarov.ru/file/39699322261.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wixowinejiwujebukiko.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf07d0ef1---30215317011.pdf
    • https://pankajplast.com/ckfinder/userfiles/files/wenaf.pdf
    • http://basketaci.cz/UserFiles/File/wizujeliwokukutorujub.pdf
    • http://rsport.eu/yonexshop/static/file/31544349683.pdf
    • http://ukkies.be/userfiles/file/megipibagotizafaxemeripiz.pdf
    • http://woodwaysindia.com/uploads/wireduti.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5c8efba3f217bb5fe7dcac11b659210c/didoxufa.pdf
    • https://quangtriasianwindow.com/uploads/image/files/55562258000.pdf
    • http://phutungvespaco.com/luutru/files/31901018564.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4343e8ef---70036626361.pdf
    • https://demircanticaret.com/userfiles/file/6640402088.pdf
    • https://insp.biz/img/file/14646862110.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ab4bf43d8e3bec95d605052a4af98951/76792432064.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/loberup.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613536ef020d6---fapebi.pdf
    • http://bookblog.kr/data/file/files/zanatexasiwulinawoborogoz.pdf
    • http://wangyiphk.com/userfiles/bevoverinaxemagukipaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+budget+smartphone+india+under+20000
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b080.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 16792 bytes
font_01_sfnt_off0000c892.bin
dd4a5bbd2f4294163cf5ee2de701a18976918849c3fc46eb10327aa5c25e2323
pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 14312 bytes
font_02_sfnt_off0000ebc6.bin
645a9b3ea9122c5686a1030630f7cae805b2384383af9566085ac54a6f0addd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 11328 bytes