Malicious PDF — malware analysis report

Static analysis result for SHA-256 f990bee6a4897553…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 05:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5a1774291bcfc438eb4393d48b8bc590 SHA-1: 4ef0730354d3987a2d96a2512d833230e9efba1d SHA-256: f990bee6a4897553503f04f7749f34bd62e14764d34ef59d84aa8080967466f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=cost+of+living+in+hawaii PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943538cd192---pumib.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/jebile.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737bdab9edf---61298400839.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc3f9a143---mivosebitov.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16083bdb841ef2---44271371869.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jijefikenig.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/mopolunirokesubalape.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7d85feff68892154c3b72c2c47a790eb/77081758990.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9dc92a21---10986031512.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4956e03f4---50659799745.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/mafaraduguten.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021060202554442.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vabokapo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/34kume69v4kh0jdenalmd29cf9/44763240128.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/56653134929.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jawodusenero.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/v14vvn6rkcbsp1ulhc0gpsv6j0/48624232345.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/bekajedajofisebexis.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210603030141.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c687f7cc748c61eaaa85cc9869a2531f/34413531636.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/5870013420.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/panesefasuri.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/xozuziwid.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b16dcae74---92759004046.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/tavasurelaxuxogebonageje.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a57ae3ad---jewikemogugep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 10444 bytes
SHA-256: eeecc8b300ec069047400845e16d632583f73fab839e3d6de91e3a842e07b7e6
font_01_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 17108 bytes
SHA-256: 31e6a9d06bcea4678b8f180ef724b9505460e91f98eede11abbeccfe73d3b733
font_02_sfnt_off00014af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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