Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91c96962bbfa2fc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 02:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e05235b332554d6bd3e8f7ca8ecdc6dc SHA-1: 511f42a388e8893eabe4feb813bebe046062edc9 SHA-256: a91c96962bbfa2fcbb756167e07c94e5f9546517e5e37425d95c101c7d542a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to distribute malware. The presence of a link farm and the ML classifier's high confidence score suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://volvo-cars.jp/js/upload/files/56793382936.pdf In PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/vofikixoxujozexoxonose.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/dimomuvonivajofut.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/85905551492.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/kapumojuzuloborigus.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/53603828324.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb31c9dbee---5130037409.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/nutafatono.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/migixasilipi.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/20196011771.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/lapakimofutalupawu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c9dcd88d---52164273491.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/sovowizilovoxez.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/mokopize.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bc1ed052---32533307790.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/51669780016.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/sekafo.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/89278337975.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c441c2a25---73687787928.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/togarofom.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e079b681f0---marivasi.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/41151515621.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/tikugeb.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/84428336650.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9406e8077---benexikore.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/4523904023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=horizon+zero+dawn+free+download+for+androidPDF 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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10220 bytes
SHA-256: ed33a6bdbf2b67fe244fba3b00906390b33ae0a3c7bfcb579d79e99225a5e591
font_02_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 17312 bytes
SHA-256: 60ea1e01cbf31d046dd3aa33db0044988f524b32e3d715f97276e34627c3b77e

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