Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb891fe57bf009a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 19:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e05c2b9445f7fb93c9fcf1654a6d97ae SHA-1: 10eb63587585be65366529824e129f77200747c0 SHA-256: 9fb891fe57bf009a2cc5ced612abbb74e2f69bf486a97b166e57fe64fc04afd0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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=50+shades+freed+watch+online+free+dailymotion PDF link annotation
    • http://bronia.org/userfiles/file/dezokumogubipova.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/rawawekobirizebujonobojet.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b25bc2f3d4ecf3bbfe881e7b829772ea/rabixabevokamuxetaparu.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/58153627982.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/49625549351.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kepizupobunigojezegeni.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/bivejopagewiwerumuf.pdfIn PDF document text
    • http://schokofontaenen.de/idata/66095853319.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/liveti.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/38528020270.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gbgdlt61vjsh0eh0c76hkbgsev/76921413267.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b8126169---79608882820.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/fupofoge.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ad7d582c---64532919900.pdfIn PDF document text
    • https://lecachet.fr/docs/files/1976155937.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lutukororagemivaz.pdfIn PDF document text
    • http://oodow.cn/upload/file/210802224227055477k4sug68ubcxn.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/lemujos.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/fe596df0c2670d9b51b415053f7316ce/83145513438.pdfIn PDF document text
    • http://fields-on-earth.com/jonumiwijomomavuledatop.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nbm7rtn2hmjge832kbk6ivp621/91354841997.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/65844287283.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_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 18604 bytes
SHA-256: a3afe43a22acdffa7a1fafbb3db3b8f2969c167a29ebd79be397e70334afcf94
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 11100 bytes
SHA-256: e23048854f7eee7ce8e17aea48ea197839cd1c996f2cb1ae7fbd520fcce5b936
font_02_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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