Malicious PDF — malware analysis report

Static analysis result for SHA-256 0debb8d18240708c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 05:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c0f278706068a3e7b327a0644059efa SHA-1: 5739c95d8f9c514dd6c888032c9a9c63419807a6 SHA-256: 0debb8d18240708cbbe605b1a8514f99071f5c7bf15e4bc7b915207a5d9ca85c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as redirects to phishing pages or malware downloaders, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=nissan+rogue+sl+2018+manual PDF link annotation
    • https://glozor.com/userfiles/file/63633848050.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210825212528.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/boroxigodelekiwutexe.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0cc7d2e69b2cadb8ec059910fe10ff23/35214264267.pdfIn PDF document text
    • https://jotelek.hu/files/file/xamopiwejuwa.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/xutubosab.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160982dc2b889a---xuxosamoxuferavuvum.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/kezekujibalafutofufi.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210815155112_ioi9ay.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///56678253117.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/41f1cd645361e40661a984e6e49f6a05/6773585942.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/tepisoxelilizadotox.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/nusepinuku.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/81133e9544870d1a5e49db7de6c93f87/xuvebimumoxegifopimilet.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c70c3046ec1b3bc5379b2ecc07cc049d/92524230141.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/robediwukuretogaritalu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/srna8cbgopq00kkdosqjv4da27/tugabegavipobetijuzemu.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/xojegabuxesake.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/57499343375.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021071413523571.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09a6d91e5---fasor.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/37672246911.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/7068015675.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_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 16528 bytes
SHA-256: 0dcdc77f3e4190790eeede4a0fa3c59e84a6c133129eddeb267efc465d044fbd
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10932 bytes
SHA-256: 952989faea212c1b4c381c292849e86c58d8d5e01c9eca8a91cbd498d32c119b
font_02_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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