Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b77e4867db77111…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 13:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4290594cd35a870d9700fc87532751d0 SHA-1: 884fcc9b1f466f394061e22d2c3b1486eb660dce SHA-256: 1b77e4867db77111da001333ade6bf641dcb4a3b19d076d3294569bc897443af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=goodee+soundbar+manual PDF link annotation
    • https://stehovani-ostrava.cz/static_pages_files/file/47193030689.pdfIn PDF document text
    • http://metallpress.info/files/xelejoninaziberetuwevu.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/tuweve.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/susivagupilodusakojaj.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/lupadijenu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/rifasowafegejukemapuxita.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/12b641feec2617cb7af8a2e9603c1299/tisitotafetigatofilu.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vuzozisokefo.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210903_603354F5A326BC77.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/zemojuvafaganaf.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/27468465881.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nokaxaw.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/legedipuzesibo.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/34230550696.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/r33upb1pg46s8unvfs42iu2puk/topidow.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635c5a30b1---fumigememi.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/69085738663.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef1981e8c---mulesisofixibefimagasapi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dobujuvupegogomiju.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/51999824924.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7e22e670---guvana.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/83189192670.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/72167870517.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/73521323271.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/22626666801.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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 10500 bytes
SHA-256: c8d7df42c0c2b864686cf408a080fd182afa286925e7f78d9d0313cfcd0aeb53
font_02_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 18868 bytes
SHA-256: bfd1b3738838ce367d92f855f8e4c735865553fa1314e298f889525bfad62375

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