Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9926f025ecd4566…

MALICIOUS

PDF

89.4 KB Created: 2021-05-10 05:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ead3bcca341ed8f4095178f55e1e239 SHA-1: c01d6d5ae649347f4f5aae944b9f09a0ff9f6e78 SHA-256: a9926f025ecd45663961fa5eddfe55a1e4c5f707d186a87cea54cf20c401cc00
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated, but the presence of numerous links to potentially malicious content suggests a lure for users to download further payloads or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083118553f50---41701160848.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077faf21b557---32610886332.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3c57c772---56194555516.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/74221968944.pdf
    • http://aliglobshop.com/userfiles/file/makunev.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4c8c24079f64e83c322a12757e511f76/23452291263.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a8240f17---pararunofiwavip.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ef3ab064---72762217201.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608462e008ffa---kibamurimojob.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073860d9a4fa---25595266321.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/cf95500b9752961846cf74821bbc6308/dirisuxekazebov.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30b2378e8---75987337992.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a774f487---67797281560.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=biddeford+heated+throw+manual
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bb4.bin
63c8f19ec51ec6ccab1488ac49ec658876e3af3b127e624f394d31bae49be3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 5112 bytes
font_01_sfnt_off00012cfd.bin
16cc44b21a62187da4a674007fd9aad998e9c9b2e2b3a76e616c52cc22c27486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 13004 bytes

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