Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff133f9ee45e5fb1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 14:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 289dbd9ee16ab1e3ecacf107425db1c2 SHA-1: 15006a73d724467bad692438c23044ca145ae907 SHA-256: ff133f9ee45e5fb10b326940cdac8b22d88ded88b9df0cc33e35d73602de9f93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external resources, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://krisoc.ru/uplcv?utm_term=video+maker+fx+free+download+for+pc PDF link annotation
    • http://ck-buhgalter.ru/userfiles/file/sexowedi.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/rusobixusidalonufo.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuginuju.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ibs328uu4ce3jt4jjngf6m7ukt/rafomezugusefusabur.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e32f0o36k9lfd0u3ed7guh3fn8/9687831348.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/jumot.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1879253168613e5e03414ca.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mb7gco3e0no9g6qt0k1qq0jria/19868401806.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/zegejakigu.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/begekomugedor.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/3115175525.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/84200306276.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d0fdc51b---jisokojowipavujosozu.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/74234115882.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pilupuberadamujamopesi.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/79403392615.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tipope.pdfIn PDF document text
    • https://mimpidia.com/contents/files/nimezetanefigido.pdfIn PDF document text
    • https://sealskinz.ru/files/file/64379591230.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/medomasu.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/tetemalamekosogug.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b341c2cd6e---15900725712.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/kizidokiwipurasepemuma.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/19612704931.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/41479818598.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/gemovafafimiwu.pdfIn PDF document text
    • https://mauspro.net/upload/files/lerizibirut.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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16860 bytes
SHA-256: e200d059562f4749f6e23911369b3879321e22df251c6c4ac26bd72a850d6cb3
font_03_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10764 bytes
SHA-256: 080ee6ccd1c291657079aee4fab9e1ceb3a85da7cb1bc6598086910fc2e3a391

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