Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c9ab6bdfaeb047…

MALICIOUS

PDF

77.9 KB Created: 2021-07-08 06:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 332411752efa21e239fb11437312b6ee SHA-1: f387aa1511a6fb5ce26f0537e223c6709cf7ed77 SHA-256: d7c9ab6bdfaeb047c092f5f6d1c0324b2515ab248ec96f208f4949f0371ccd11
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 redirecting users. It also features a link farm pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://caffepontoni.com/uploads/file/62052216478.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cf60f117a8707183c8f14ea8abe89ac9/84937209385.pdfIn PDF document text
    • http://cga82.com/admin/File/mavekidife.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dabd43d1f---wudokixutezigodu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0m7lk75uv0k0i26h9l99v3ele2/16533395639.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0536c9d2---jirawexegoxanikoxezinofov.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a16cdb02ce3---belijenaveruzivusugide.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/77240268610.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/xofipa.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/37378726422.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/94092538997.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3scvdk894svanimpv40ipit3uq/tetekun.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/70771971308.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/xalewinakapodewadusogugo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2r9148ogss2a4hbb1q87cvcjr2/jiwovivorekusezekidelosim.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6e9953b15584cabc9fa22f68e1d1fcd9/61089163987.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/63572485310.pdfIn PDF document text
    • https://digicpictures.com/downloads/sajixujiraxopevomilusog.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3af4731b---dutiliwoxuwexidesik.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/75919715239.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/55698740117.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8c8bf041b401bf6e6feac99af236f48c/94864765407.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/25251893178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=harley+merlin+and+the+detector+fixPDF 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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 10780 bytes
SHA-256: 7da704a3e5a86edf93dce887d0e338638c49f82986f53cff9edc9b2dca17f291
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 16912 bytes
SHA-256: 6bd75355feb57434d4a7aaada56f3b370208a7116a4510958b7cb046741156ec
font_02_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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