Malicious PDF — malware analysis report

Static analysis result for SHA-256 b660cb675b81d9c4…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 10:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b729f9fc4f3c68d483334943573edf8 SHA-1: bf00cb5e196a9a04bc2163ed56eeb9295a7e870a SHA-256: b660cb675b81d9c4f4159672f31a3b6b7c5e2c1a75c200e413d0fc963331c50a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains. These links are likely intended to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://archism.ru/uplcv?utm_term=prophetic+light+daily+word PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/ketisiguki.pdfIn PDF document text
    • https://rinducm1.com/contents//files/76358106942.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a31d760f---mowipozujazaputemexexize.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/50349595545.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/78981253727.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/plm0fh7cdi5fugdc51hvq6ov2q/79514941919.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jemimuki.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c2fe68dc96b930e83491023318c42c27/66830691870.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210618_62DD9783F403FE8E.pdfIn PDF document text
    • http://alkanboya.com/files/file///60137978301.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/javozasamu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4aeab277a---85250850518.pdfIn PDF document text
    • https://cristalensi.com/public/File/77313256267.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ea09c7eb---58139337077.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/7497907387.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/16772467098.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/gategafokisusat.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pufivusakexij.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1620872757083.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f40f81ff8---xiporuzi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/saeep4af310vbd9grjc0iudfs0/75691922237.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a418ac9f---rijiminasigiri.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6f651bb2---90895990164.pdfIn PDF document text
    • https://tonitomov.com/picture/file/34471757497.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/46298519027.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/gigibowakiw.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_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 17840 bytes
SHA-256: 42eb7d4e3269dbe91312789619d95545ffcaf39e761a48cdcec9556468534b03
font_01_sfnt_off000130f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001490e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490E 10720 bytes
SHA-256: 2a41eabaf9cf3cf42b04e6c4d7c3cc48de4fdf574eeda596e886175d1d23791e

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