Malicious PDF — malware analysis report

Static analysis result for SHA-256 031a9165a17c64b7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 04:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae4dceaba64cb9a61fd18373e13c490e SHA-1: 405fbc0911b4c6cc9e13575e279e0d35774c6376 SHA-256: 031a9165a17c64b7f263939b75431d505beb02b00b1a1a505fcd9d013794e715
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting. The numerous embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. The presence of embedded JavaScript further supports malicious intent, potentially for exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=simero+ng+cloning+app PDF link annotation
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/24087034190.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/20917201727.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/bedajelugodisidatixuxe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l38qolnihpeesqrtn2psoteopm/zosanorekuzumemuwebarufu.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/43145100552.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/30223841415.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/milagizoguburaru.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/jamipevovelaberesafuxi.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/bupuzoles.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/3388801205.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/likere.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/godopotiv.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394b744f948---65386211724.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/7465015693.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210914042938.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b6c378c02c218974f587d6048b61d7f3/99140499660.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/fexaf.pdfIn PDF document text
    • http://sartor.ru/upload/files/tomazidoboxaxe.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/vexupitim.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/wugevej.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/pofapefofilomalamavomaxod.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/8309309007.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/werakokofufemodukasanot.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_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 18560 bytes
SHA-256: 1c1a23d561f1037c81eb4e48a5b9cc71f86d23cc9f1f12a8f5538d2d9e42310d
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 10528 bytes
SHA-256: 3dd7917e51917244d5816f7f5ccd35a82db76a093185fd50d50a36ff1909a39e
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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