Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c72ea61c034b8b…

MALICIOUS

PDF

108.4 KB Created: 2021-06-29 22:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f2e1f53c2531d1885e089e7cf1d803c SHA-1: 578e8236a312ee3a0da5a740ebd1bb458fcd4b18 SHA-256: b6c72ea61c034b8bfe516e7ec90e3c151e0482c526577c3d859dd146432b4f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites hosting other PDFs. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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=tree+pollen+count+near+me PDF link annotation
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/gghq9tneo9a3msljq08h48pmr4/wijubufasukezu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kigulowif.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6df5565ce29a2e6826cf46a0727cedab/41691536404.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ksbapcskummt2tvalpckqicb8t/61677058637.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0a86263b---sikufiluzejoxibulu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/51100903099.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a417ce48938---pefobujipotinoziw.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pibumubivatikaxule.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/aabcb7014047fafa436ab1d8cd412dcb/28794532457.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/bolov.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/ramajaxaza.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/li1gsq8g5l4q5m25pnjeqg3nd7/basimebexapefozufotapibam.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adf1a297b---reguruxodezetufu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3bbf24dfe255b67a28fa57527db9af01/16415035319.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e88b82a13---92962734370.pdfIn PDF document text
    • http://coffee33.ru/archive/file/pajinajagabebilid.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7803b7667---togedisetukofutuzuraba.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3668944585c6017158ec0879a0ab2bf6/63781934484.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96e8b1c95---31452640451.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf8488381---fizujekepujurepokikidobu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0478ffa2---62255865981.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2ee492336f---55015066164.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/9ee5epl99p1h610tli7eeooprg/namepediwemaweje.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/16188835466.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb29dc45c1---wibala.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/003210d4e6b473c42bc80cd7da3750b2/nijudebezokavezasof.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 19024 bytes
SHA-256: 709349e0563f14d02ae8c22d33a33c77bf0e2e032d47bf423b18ce78d6468aad
font_01_sfnt_off00016c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C47 10340 bytes
SHA-256: 3c16e315ecbb9e81df75353433048adc76f2f504af3db90757f87e2f09e88fa9
font_02_sfnt_off0001838f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1838F 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off00018ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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