Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b2966d8c2ea521…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 11:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63a3f4731ca67a3ae7f6e31d5c5cb20a SHA-1: 8efa7bfbaebccf061f388dddee955ea8fd8ba2d1 SHA-256: 97b2966d8c2ea521c04b73683c05d1d00ea8823f63f7ed467ba3341e04842673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing to the use of compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/513677a5f1738fb86afc97ac9024fcc4/muzoxuludefuk.pdf In PDF document text
    • http://gintaras.cz/userfiles/file/90289615929.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210630221151728.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e9c89e90d58285327d160bf8a16369c7/79632917690.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861cde567a---xepatopugapa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/aoll0dsnfisb9ej53jtm1blat1/zunidifawinuf.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/42b25181f53854c7f0c073e4aef4541e/51829387571.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/42242474883.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0403e9519132385626637e7a29ad6aa5/29502701775.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/81162072856.pdfIn PDF document text
    • https://iwistw.com/upload/files/96461061884.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e10200223---lesokofexoseviwukutufedum.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/48841792540.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7e5666cb12340ca36e47d466c56915bc/42128001564.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/20520899806.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///44404296726.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/bejebusakapevapavekarud.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gefirajemi.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/80123673011.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/pokob.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9705bdb74b---84716986526.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xokefibizaborara.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/otcpc16mf5h5m5qs4s7nlmv7iq/2907112120.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xikapej.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79908741ae---bokifinuramisosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=when+can+i+trim+rhododendronsPDF 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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 10580 bytes
SHA-256: 56cc660f7761bc2daab683eb4d7d22e97525e19322385fdd01b72af235bb3545
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 16464 bytes
SHA-256: 2f8b42bde96987ef9ba80b4501809de0fae3bf3b588bf2ccd3a7d2b46d6c2f19
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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