Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaa29d32da6ac9e…

MALICIOUS

PDF

89.2 KB Created: 2021-08-09 06:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ebb7f0445fff766042e77ef2d5ded471 SHA-1: db12f114953e32a9c39ae8066c5f556214ea28be SHA-256: 1aaa29d32da6ac9ea4d6365dc96ddc7c6dca210b8ad6a608b364fb076d399201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple links on disposable or compromised hosting suggests a link farm designed for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa1929f43d---17544524902.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b2128d31c---95554748248.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33aadf0768---femaxobedudigimudegebuwi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0bc260369---34812482262.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/bibalow.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083caf4cde93---sutoxajifutajobixifewega.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ghq2vep74i7vtsr8368gltp3i0/goxosixozidadalesasi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c2eb6b75cd71e2303d85273d0bc66d7f/5323804854.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/libopijijonawiborijedop.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/pepunuravi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72f012ea---35408048030.pdfIn PDF document text
    • http://tchid.net/userfiles/file/kugunopebarin.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/jubotuwibamemosu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/94009030755.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/31179038305.pdfIn PDF document text
    • http://unseretochter.com/images/file/28205533635.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160903dbf0ea8a---bodamo.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/48390666066.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3a3d3d9bdfeeb505be880410db9d115c/97580668764.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/jomalak.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6s219370ini8dclhaccppepa67/vitafeximosuzexovujolexek.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0fad887d28bd9cf55ce8ccf1833feaf/vewenulonavemobujolomim.pdfIn PDF document text
    • http://ombs.ru/uploads/files/rokerijufawaxovogadevoku.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/dupajatezoziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=articles+of+confederation+1777+pdfPDF 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_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 16828 bytes
SHA-256: 64f3dd3a47d16ff68e28d0ba2b14f828b0d982f16621336c0e2f1da3e272888b
font_01_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 10696 bytes
SHA-256: c34cc0003efb529d12c031f16ffffc3ddbdfdca3d87f1f051b7b59246d2db5e8
font_02_sfnt_off00013e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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