Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fe40976fe299fe…

MALICIOUS

PDF

71.4 KB Created: 2021-09-01 10:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fb207b5d62bc5347711781aaf26ad18 SHA-1: 4a210f34bb5bfb16498566653ed93ecef2c30b28 SHA-256: e9fe40976fe299fe6b1dff7066a91e4008ca577c0d2c3679f16ca71ef330c1ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=sister+1st+marriage+anniversary+wishes PDF link annotation
    • https://stalbeckers.nl/userfiles/image/file/54053826203.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/46670914763.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108142222539949.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/48897827265.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec6da5c781---binimusag.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cebe62a49---12777894246.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/52366429336.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/tinafuximopadibaj.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/84358570202.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/26722902054.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/26164682838.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/lutebejolukad.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/50a4b9b4c8ca7174a4dafa1b72712553/24080304977.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/xuvitopedu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kd2suivnhqt6v4k8en9kdcfum7/mogisejokolulurigi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/46a373321bdb500cb9f4e2949315890a/fulolitukukejef.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/59846173493.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a452abcb94d---46282091678.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b58af0bafc896ecec9ab4d9adb3ce92b/8602005156.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1c919399---94346795413.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/vinuraruga.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b991d238fae2fd356241d21a36d77ca8/jujepatufiwusigejubeju.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/zuxixufevakukatusu.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_off0000b862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 10780 bytes
SHA-256: 744a8910c9bb5a0c9f16676c3de3f57f1656f57a70d49c060fc3917d004683f3
font_01_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 15352 bytes
SHA-256: fe955242f927e498d86381d2fcd4bf03ae76ae50feaefe510ce1c0b4a66fc8aa

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