Malicious PDF — malware analysis report

Static analysis result for SHA-256 979427c6655a6612…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 22:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65c4c5b0a57f9762f2f3a439b1b267bb SHA-1: 0187125416a9a7d2c4c37b2b8141805915c9729f SHA-256: 979427c6655a6612fd1466b9bc5a5921e7b77c39250ee9ccb6f8056e0ce2b105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=watching+the+english+pdf PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c02317db---papewobixa.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/wirevekigizasi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e1ba2870---5799846740.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/73061733167.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/topidetitidebuzaxubizekas.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/75695819006.pdfIn PDF document text
    • http://101balkon.ru/upload/files/99887482801.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/94271439416.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/355c55296d9fc9a3d848ac6fa1a792b2/robamekagemewumu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05e85b05d---luximadoxoludikun.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317acc3187---sibabikirojuvop.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3f54b85d---91831598210.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/duzosaduxajulejuden.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/nebejoxijuvubetoj.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/29855476445.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0195700001619798082.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jugewofapemoguto.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/mokojaserunupanutubi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5196f4512c3ac2d62991c25eb55a5f08/79389898740.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/psjsft4jhnrqgd6pq3iu237s42/pofepuraxijubow.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d42ec326817---nubewixamosewatezovisod.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c7561e69---xaverugapuselad.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde908cea39---penuxozofedak.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 10672 bytes
SHA-256: ef0582b827aeda9bde1c96a98be73e2a70e26b94c9cc992e66f7ce21cbf87238
font_01_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 17316 bytes
SHA-256: a19b6674cb5adb1fe3a510077cd5428f675ad257a35360ed9b2411b3c669234f
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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