Malicious PDF — malware analysis report

Static analysis result for SHA-256 0996ee880cb262b7…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 01:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c42cee314f0488996b82a1c14840238c SHA-1: 81102b068593c4ef5caea1b83c8c828fa651d2b4 SHA-256: 0996ee880cb262b78557bdbf38a25ac2ff8231d59acef1ff86da7036317fd26e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, and the document body was heavily truncated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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 https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gqi8oj736vs4lu2v4vu7dsbo0r/sejebugofumifowebawepisa.pdf In PDF document text
    • https://digireg.it/upload/xexakokowakazijajijapax.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077fdf04584e---rizekawokup.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f177o76lnmaui4kjkjo6c27pbh/dadegafitetixapowajaveja.pdfIn PDF document text
    • http://apcmagon.com/userfiles/fewelisovurugumatuxoxin.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f81886bc52---pafozemumokidaxanize.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/51054190772.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/kepuwotagus.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/77756594911.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/gofujofod.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7f5db9a00ebe19ab58c6d48e890e6c1b/warobifotuwojexo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/70379733735.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094baf43ceee---sagowugutax.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/72aa226e2d7304a959f42abc9bb779af/67016587473.pdfIn PDF document text
    • http://bdnchem.com/upload/files/rafijelovujoloju.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pobuzimawixasefizoden.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xoxobaxinusazobojezegaso.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/37ecbddffb19193cf6c9fe892c084707/31371439507.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/81736590762.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/31047377875.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/mavipuvisadinifatujusowut.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf66aeb5526---goxezaxotusekovavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lord+of+the+rings+riddles+and+answersPDF 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 18032 bytes
SHA-256: 60b1022b95898d55727afb277b4cb006ed54e35d5dcf836767444317d5502e38
font_01_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 10676 bytes
SHA-256: 067e7c2f5d26b0279bd2850dde886e1cf6b5979cdb5ab6776ae5982fadf537f5

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