Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5e7a4ce20ee4a3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 15:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97ce99a9f10976d1274eb2ea45034a8e SHA-1: 6d9f617deb9f1b734330772e58257e7937f8827f SHA-256: 7b5e7a4ce20ee4a37961dd751ef9be44e2c17477733c620e6fe26c6d227c9937
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noospc.ru/SITE/files/editor/file/vidubawanojuwobe.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6a2403ce---somukepuduseduru.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/85380022372.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/79517670465.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae35a0ab1bd---zuradujirev.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110186ab20b5---bolit.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/kevebupisirezomokerojuto.pdfIn PDF document text
    • http://henca.com/files/details/file/55250892537.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f1711ac727b100039422bd31eda327ca/satifemoza.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/dagutexufezoguler.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/2873093029.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/61396380171.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe63c97e78---lenaxabimevogovanefegefo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9cptqci07ghmo6m6tap7kblnc4/jevemivibagomez.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/81962498382.pdfIn PDF document text
    • https://tl-systems.hu/files/files/bidoluwaraminupobafuv.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/60804102071.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf7172485---nexawosarosujadesakeziju.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/fopezedutozexosopema.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/598a1d6dd118990e66a4614e97edd5f6/7561132412.pdfIn PDF document text
    • http://platcometals.com/images/file/xaxunufunegi.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/jufunovogigekazale.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2v9l8evj0ggpotfi8defjmi0d2/lades.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=create+vector+pdf+from+autocadPDF 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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 10568 bytes
SHA-256: a70e9e0270dbd1170df2c39fa437a68e5292f0f154b827f6e9ff7a4451ff16df
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 20272 bytes
SHA-256: f35f7ea90ab1bd78d27a9519ee7f7f714817d1dc5682c0a9e7d42799c79e6323
font_02_sfnt_off0001323c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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