Malicious PDF — malware analysis report

Static analysis result for SHA-256 6987186b539ee68e…

MALICIOUS

PDF

86.2 KB Created: 2021-10-25 11:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7165169525e1835a83f8a83a81d0a4f2 SHA-1: f73efd5ba9ce8d03d63c288d85d20a3739d09076 SHA-256: 6987186b539ee68ea5f64311f354591c075e23f4fa6b6fc5a6ffcba12c47544a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and contains numerous embedded URLs that form a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely serve to obscure the final destination. The presence of embedded JavaScript further suggests malicious intent, potentially for executing further exploits or redirecting the user. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ctcinsulator.com/uploads/file/zakabakagilubix.pdf In PDF document text
    • https://mtestbd.com/assets/uploads/files/vetuzuwasawolusate.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/ludazokerona.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/518b0095f96bee1dd9db39de99ebe9d7/limojobokudafu.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/65417292283.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/68287785044.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a71b2ec0dde29743d9cec45d387aac09/89205993080.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/19985778977.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/16251690393.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/gekaxizepejif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f211210e4---98938473942.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xojoguvunan.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/wesadolasu.pdfIn PDF document text
    • http://czminghe.com/upload/files/libadikemekaleji.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16166b41307937---86964755799.pdfIn PDF document text
    • https://codecs.ro/images/file/71129927628.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/bigidavagogexolemowo.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/gowir.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/mojuvu.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/katoniguge.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/zoposazobe.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/15282915738.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/joremitiz.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/46948318618.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=pho+duy+broomfieldPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/38369717464.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 10440 bytes
SHA-256: 09b24ce95678883ea343823310435860b3b4016bdde3f50cb2e2d35ffa3d7711
font_01_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 18676 bytes
SHA-256: da150e39a83ed23ed5bc98c6e9f8fb2dbc5873ae35d98a45a71e763b976a374f
font_02_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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