Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b75c0bba7dc3a5…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 18:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 309c69b3872f6a756836dfea60f548c5 SHA-1: 7e8195fa4d9c307291b3de8aba034aeec3bc9ceb SHA-256: 65b75c0bba7dc3a5762ac02ca465e81196cfdc784eecd27c891c190942d43a49
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used to distribute further-stage malware. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 http://i-harmonics.com/upload/files/vivibax.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161376a255c508---pakilivolotopigef.pdfIn PDF document text
    • http://aviseco.ro/userfiles/file/ramajipeleramoti.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/202109032001235666.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/dawogariniwir.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15ab9e1e1---69011312694.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/64357262448.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f9ad5e7f---75207185240.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/ronezepokefofi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ceaffc84a252e553b08f1e6a371aed7c/zomuxanajokijaxoxusizefol.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/rerobo.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/jipolofereligodanu.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/popofa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c67b09a1---3320000028.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/62566926915.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/88197952864.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/pizofiginadibal.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/fisona.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d272e811b7---5194952448.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f5658f51be6e0a8bf894e231041ccff3/43745420718.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/26489908948.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109040719125957.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/34595311082.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/23141535681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=last+day+on+earth+mod+menu+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 22604 bytes
SHA-256: 231568ec98322c7f1359141659b6fe701e60402c4267a98c4faa77d8aaaa202e
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 10788 bytes
SHA-256: f5650c3a09b877303989d559350db3fd280724a60966096c4195699b82a012da
font_03_sfnt_off000145d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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