Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f7d0f08cf74236…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 16:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1eded68b4af84f38a6ea8af18d2e93a0 SHA-1: 1cc640961093608520a800eddcb17c40b5e403b6 SHA-256: 62f7d0f08cf74236ce5dc57697178d5a60f983da0bfe84e49624dcdabcd87f9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c564157904fe61e37b645966ff5b391/90261209692.pdf In PDF document text
    • http://baracenter.be/userfiles/file/49313456666.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/61994970764.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/binobofekozixasesomux.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fea7b847d---nujuxonubosa.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/75745088143.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/vutikesutulisupotetomufoj.pdfIn PDF document text
    • https://ancoraeducacion.com/images/46437361249.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/xudewulevovavugagulus.pdfIn PDF document text
    • https://iranjobex.com/cache/fck_files/file/49869059431.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e24ff6a0f68b9f4dbdc226c30ea5173/runenutivoju.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/69n8a5n8prr63vb7do3g9bg7hj/dagamixilasago.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/39024042556.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/jegariwobetu.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/71813004455.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/tobixixugixo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ba6cce91e77d67a2822f1e4997b92528/jagikek.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/43306179873.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/10503082473.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b89b77648a7e0e5597fc531e37894667/litumisojeruselopakoneka.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/18523652842.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/janeniwafegef.pdfIn PDF document text
    • http://poorclarescork.ie/images/gurojiwelo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/74951360654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=response+to+intervention+pretest+skills+answers+pdfPDF link annotation
    • 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10780 bytes
SHA-256: 01b1206f30d9963719c2cf2be3093180e1541b866346c45ce9d872a14fd2a467
font_01_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 18644 bytes
SHA-256: 1ad7f5e557213b8e89c756b16d6dda4eb9ae0a4c6aca7bf3c410c7c390112545
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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