Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f2284e1418e7cd…

MALICIOUS

PDF

112.7 KB Created: 2021-08-09 16:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a94af72ac7d60111c4208909a509239e SHA-1: 5a98e9d7b4c732cd2afe7ab2ef64971fb29fbd57 SHA-256: b3f2284e1418e7cdfc17d8a993110821136974fc7a5c5bec425d3dcafd58d8eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. It also contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c177c6268---93521918851.pdf In PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210716_AE2E86C80937307B.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af214cb8bb9---89119288811.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a0da91fb7cdaf8c9aea11e125cc2b1e7/fipofitunipajarane.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/502f2be14aa70cdd82cb241f02eb7a90/gugotijegiponavopo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/2sombvv09g22vlhedn479kk2cd/xuvorepiwopiwovum.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/gurusutuvumafidojiz.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/8791153845.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/lafebuxifurivapeminizuta.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wudanofubaxa.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/91586550660.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d4707456090---ponakejuxawagimo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea552eaf16---zazekigowogugedavijaxizi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b31a1b024---zabifigaleso.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/7488577445.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/52596920592.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/48q6062loj8dmj6uf2k2n0qit0/83807882664.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae389e638d2---xopaxalur.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f267443f8d9---bilokubodifupurekusuf.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5e90ed4c5eb1afd76f19e5ea8ec7125e/fugisabimatevuf.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/96151205122.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074adc2134ed---33843654443.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b998b99203e---jelebamajiburawogi.pdfIn PDF document text
    • http://kasargod.net/uploads/file/19352490904.pdfIn PDF document text
    • http://kisito.com/userfiles/file/43067242692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+dragon+ball+z+budokai+tenkaichi+2+para+ppsspp+ubuntuPDF 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_off00014087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14087 4872 bytes
SHA-256: 15e2b548066f5200131dd841b222a0efc1879e3bc3a4e8620f5bbb5b596fbc1a
font_01_sfnt_off00015332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15332 17604 bytes
SHA-256: 2321f05c40b4a94cc0aff4d3f8ddcff44be5307868a7240cea45fdedb3066b0c
font_02_sfnt_off0001812b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1812B 11308 bytes
SHA-256: ff7fb2668694ebcf9908d5a4b640c90ce237b38469ace134305cb2aa3b515583
font_03_sfnt_off00019b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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