Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8294064ca856444…

MALICIOUS

PDF

74.0 KB Created: 2021-08-29 05:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e7f52d12494d78faa06f3fba5bcf76d SHA-1: cb3c618d43b207f06eb4f0b2d0c5a548b4cd4936 SHA-256: d8294064ca856444c672ddbf84222161dd44b9976a932405f44dd93e18061e5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and link farm heuristics indicate a strong attempt to redirect users to potentially compromised or malicious websites, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the PDF and the associated URLs suggest it's designed to exploit user trust by masquerading as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/464e45023502e92015dc66135c8e978c/81589654122.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dc88645fb---86977190170.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/xepavuxunefovonovetewezaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb002ac80---94043315601.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/aj2b8tjt4mdgvv3cf5ccmphqq4/5444243997.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/95aa3d88d0f5ccd3c647684a129876e7/kuwubugasimipabituxiwuri.pdfIn PDF document text
    • https://avela.md/userfiles/file/51858449756.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4329741420---voxidunutebug.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086016b989a---84391343141.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/aa8ab47e294d017fbda9439237e0cc0a/tefabidemotenasipalo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wexovux.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/15782634450.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/87585205441.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/jevogosupaniwolelizudu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xagifofifidogowi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c5cb29671---67727774227.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/85026790841.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae8f166a63---56855785200.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/mexalexuxapi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9f9e03669c8e645b358a834f5ac9daa4/tepesosidid.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vegoj.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/72954071090.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i017ugch136kldinpbeskebad7/56230089923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=winter+dreams+study+guide+answersPDF 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_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 10720 bytes
SHA-256: 05389a6320a43e0cb1cafb903f55efc5f134918b4efa2938d5b182935674e866
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 15952 bytes
SHA-256: 6f5563aaa8c3cbaa7c2d4ee53165b7a3edc6037dec7f84282416e22a94bc17fe

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