Malicious PDF — malware analysis report

Static analysis result for SHA-256 d697d621b43a03bb…

MALICIOUS

PDF

92.3 KB Created: 2021-07-03 09:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5baa26dd50c7bebac7907855a1958664 SHA-1: 2b56a1e807da8abacd7c678074defbd8855943ec SHA-256: d697d621b43a03bbad602191c940fcf087176514e2c79e652524f7cb7af3bc04
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the PDF is a link farm containing numerous external URIs pointing to compromised WordPress uploads and disposable hosting. These links likely lead to phishing pages or malware downloads, aligning with a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=tell+me+a+holiday+joke PDF link annotation
    • http://nova-auto.com/upload/begonulexinuf.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f473bc78bb615fd3ae4cdc18b268fcef/30149366722.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/43290941002cce6005bf92047ef7f1da/kawepobigodesirave.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0dcede0d---7289157970.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45703d43d0---sugukukabe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734f6bb02a---wimolatazapezopota.pdfIn PDF document text
    • https://aspirans.com/files/file/70621836856.pdfIn PDF document text
    • http://ibb-online.ru/f/file/32317690164.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a813edd90c9---23244661224.pdfIn PDF document text
    • https://aspirans.com/files/file/11799507837.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a912f4ae49---rijoliwojajus.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd118da7c7---65617688112.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747b44c6c9a---rawemapuzaj.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1860c03bc9d59ca1c23f3d9ea42ec95c/79754045652.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3410a4a892f06f2f7306bcdf94af1736/66306495665.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/panetuwewidepiloga.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160abee4ce25ec---30828923650.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/77814229407.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/55265143217.pdfIn PDF document text
    • http://renovator.cz/files/file/tobepademulivajadexe.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/96578834571.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_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 18752 bytes
SHA-256: 8495f65673b508d00ab250fce21539e5c2d70a66abda54a2ade9bba6fb0575a5
font_01_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B63 10344 bytes
SHA-256: 842501286116a73074a3d89ec510a30c1de7b492620da5508802af0094bcfd0c

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