Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b83a6aab445321…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 00:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b9d60df497f1f0a100762a9264919f5 SHA-1: 7c5d4a104e60f65e39244a572535c89cfcd955c5 SHA-256: 63b83a6aab44532142ce75422a718f043c9cf02f2c00f911ea325c47f0b7da59
156 Risk Score

Malware Insights

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

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, containing numerous links to compromised WordPress upload directories, suggesting it is used to redirect users to malicious sites for phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support its role as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dad075e59e2a78b9de413095e889345c/xaguxodezonididilorivuda.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70e284743---2465022206.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608771f06b622.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/90087d64027c58c508190e522d51d683/tekifokitunitimuxaw.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b557f3fae---pigozupojarumamusexunik.pdf
    • https://hyosungulf.com/uploads/file/97019742422.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba055b47f8---51228750376.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f5af38b678eef9a2c2bbb44571206622/98887074457.pdf
    • https://rowadalbyt.com/userfiles/files/99379271985.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c153c757d---juzuniforusejuxo.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee39093e4---81189488026.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a56d13beb47cb0179777362c58a8e64/tuguvunifediw.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a284ec21909---xovidijujil.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc7019be8013071eaacc7851bba66d6e/55336111709.pdf
    • https://alternativecarrepair.com/userfiles/file/wazupewijafozobef.pdf
    • https://telewebmarketing.com/FCKeditor/file/77526423607.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4c2a017d---49503467306.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9278610243---fupavodaki.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bec33729694---98975155705.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af04b0172cb50111b90faa2f35127668/pewanajikagudef.pdf
    • https://geneticapanama.com/userfiles/file/78272309508.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeccecba1e---21008933693.pdf
    • https://nbtele.com/en/cache/fck_files/file/fotonerutisem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=signs+of+infected+gallbladder
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b9.bin
6fc33e3775024a57288cc6d857263de83107e256bc379a81d932498f880b0095
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 16532 bytes
font_01_sfnt_off0001119c.bin
0f3ede0d016ca5967a374c383fa57943b667bcf46a253a1838530c107061bf2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 10864 bytes
font_02_sfnt_off00012a96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 16792 bytes