Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e16829cfad2450…

MALICIOUS

PDF

96.8 KB Created: 2021-06-28 03:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea7f5883196da209f99a0bab776ec9b2 SHA-1: 0b0250d44116e4bef490ffe5a6e7bd3ce96c7e59 SHA-256: d0e16829cfad2450b533ada4af141084e801ff7e96e7955ea8acd9288abf63ec
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings confirm the presence of external links and compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=android+1+avakin+life PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/as58ufarrg6v8gc090e56b1g22/mebisodofepisaril.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4ovfs3lf12j70cr6jcvq4k1vh3/25781296271.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9e8e44b9---kafosajabofulutu.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/2375380061.pdfIn PDF document text
    • http://iltorg.ru/upload/file/polutemizalokaduxegaw.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/960f84d5df2e5cb456a7bb2ab3d28089/majikapujifeju.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608313383119a---libebilawivo.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/gegavabi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pgaat9e6u4kav0dn5trrutevjm/72939121327.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e304f4c3---66035439684.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d13911a88---91928890380.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/daloxusuzopejalupazi.pdfIn PDF document text
    • http://npas.ru/pic/file/61060520947.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/patugagalowonome.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/34166479684.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63be290ca0---rukimoz.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9d940e4ba8576941e569dcafc551d97a/kuwaxuruxukakesefumivino.pdfIn PDF document text
    • http://runo34.ru/attachments/file/66868686812.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/voworopagosedanovalumilaf.pdfIn PDF document text
    • http://synowka.pl/galeria/file/8735510394.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609dab5cd15fc---viludugurikurujitusejamo.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/10758760087.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_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 18580 bytes
SHA-256: 79a518381e454b938fd5e12727f0bbf6d024a7c77ffb7d69b853880fd2abf550
font_02_sfnt_off00015dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBD 10272 bytes
SHA-256: 89973562faaed8e5f5706925e89721f8fee504cd4a33257caffe22105aa3520b

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