Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b9a970fe88d57d…

MALICIOUS

PDF

81.7 KB Created: 2021-08-19 06:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 437b6828afd538db93aee1922f43d694 SHA-1: e9d393e98acf441300644133e0e890b3768d19da SHA-256: 99b9a970fe88d57d541fbc62370a1606ad67d8bd42d5409af20008ffa0d42cf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=brincadeiras+para+retiro+de+carnaval+evangelico PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b93b63c0---budozukufezen.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dvtcvjtrsev8nv2kle2pbinmvn/23015053570.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/57544891991.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/soxojejegigowozafinew.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a82a232---gukukufulupokav.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bupinigaxavesunumu.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/27541661907.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/17348437720.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a2i6qb02ehlqdh4id8eri1k2rq/17174160555.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/45075877285.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210702_96C6D2337B8E847C.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8d890dbf---72478457477.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/83446998176.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fdb9164afaec7e66c583cdf116d97c5c/kolomonakabekotawexizo.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/rodejanudileguzofulekexe.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/47daa8784b8bae3f2124c9d1fc97496f/jokesabekofeborazebilaf.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/tedixikuze.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98344452130.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db59da0d4e---xuwomadoviropusoru.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef852efa9a---77576953475.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/19077301360.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb753ae13e2---xunonubelek.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a7651e17---52244072088.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb6034645---diwigakovobutubinu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5c9a3db37d682b76fc12960a69e0800c/9884217981.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9003a587b---63668573084.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://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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 10808 bytes
SHA-256: 74cd931ca95d78d6bd406ecb4c82131e29b4d7866afcd683ba89c7beb5533583
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 19344 bytes
SHA-256: f8e75611e51bc84ec87cc3d9b2f28d2171676931691b43b64f6ecaab291c01c3
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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