Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26fb1527403417c…

MALICIOUS

PDF

74.4 KB Created: 2021-10-08 11:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 637e3cbbfdabd7de84f122724a3e6828 SHA-1: 62821819b3c4e014496a0972a86be7d1a3fd7cd9 SHA-256: d26fb1527403417c1b9988a09080841fa997fe158a87022c25137eed853f2241
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=regex+check+if+string+contains+numbers PDF link annotation
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/86330614766.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/berasogeza.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/figekinukekuditojeru.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/pezofi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3uoql4hf3nm1k443fsgs0sb1ce/50789043739.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/gatozopimu.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/45959632371.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/posisinuzodipubid.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kusetaxodifakibu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p2vkh7r8389vrsii2fev0oq48a/fapeboritusokov.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/44796627379.pdfIn PDF document text
    • https://bloc-immo.com/images/86812600309.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/baperobemaxubuluf.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/78278292652.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/16125729956.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ca528dd7bd42676bfc7959d4050f3d33/gagevusirutirubemukofuv.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/gijomevurepa.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/remalapulivutotidatab.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/tomawexisexakogejexewuba.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/83703481653.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/gosefazuvelipazasifi.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/60462693600.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/1171164849.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/69792995041.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/29826501635.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/60771010875.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/25475274555.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_off0000bc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 11216 bytes
SHA-256: 53bd92768e111a9514bb56297aaaf5dff0c55cd272fd768ba3971e3a7ef513d5
font_02_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 17004 bytes
SHA-256: 1b18872e6b93a7f4fdb05646e48282285d2476e2ced9a4f997e1c5c1481cc361

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