Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a541f828712ad54…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 01:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 698715a57ea1564424fccda254a6ee4a SHA-1: 304d81d047ceb439bed8ed63cd1fc75e275ba231 SHA-256: 1a541f828712ad543cc8c239e2f5cfb4f3db03ca1997aaf0e0f7875190e368fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious files. The presence of embedded JavaScript, coupled with the ClamAV detection 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=watch+heroes+rising+sub PDF link annotation
    • https://petribax.nl/userfiles/file/woguredizavalanilemikejif.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/rezadulojabatiwulopewuka.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/56726509019.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140427084298.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b2fbfc032d9d2bd2fd8a26b4d273dcfe/ritomufugevujo.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091406453673499.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/fipaba.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/96069746004.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/vinuniragewefusuvubajabe.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/89809622226.pdfIn PDF document text
    • http://valeneighbors.com/userimages/30829639528.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/085095d047a3d46ccc3b01c7f4532c93/10150177414.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/fotogivotekipoxigaxa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae0081073---35412848842.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/vubozirowalu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161421573a283f---buvoxofipuxa.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/fefore.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xalasumovatedivawa.pdfIn PDF document text
    • http://zeci.nl/im/image/livupogaxukewidud.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/1468178121.pdfIn PDF document text
    • http://biosite.ru/images/news/file/90265456402.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/70877181716.pdfIn PDF document text
    • http://standardamulet.com/files/files/jaruxawurola.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/71103066938.pdfIn PDF document text
    • http://flirdining.com/uploads/files/pazepawumedesala.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_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 21980 bytes
SHA-256: 537bd4798b1c8c5c2e32a077e2989f4b32c4a85195281869cd100a7f3bb730e3
font_02_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 10696 bytes
SHA-256: d32a28fc66d73f5fa0225662d9f92af32d4c386a0b19af2f2411efd73801249d

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