Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e8b1c54a030eb9…

MALICIOUS

PDF

80.6 KB Created: 2021-06-26 00:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb10a246144967d6e15b32a66e6cd444 SHA-1: 3c5432d1cb7ae9ba5d008bf7999dfe8f9ef0124c SHA-256: 42e8b1c54a030eb958e998ac3f9f17cfc10ce5f0c24e8135d30849fe1f5e1ae7
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6d275d41---mefutale.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954a8cd8400---79518336104.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/daa2d79d7c12d90e8eaf1d91e9f6e833/3545115487.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2a85f25ecafec26ff7b53e8bc7d0ee1c/tifitoloduzom.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o3od1286kej3g82tr4c6ai39p1/40689356628.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5e9cc307---24086870278.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8d9b1a036---56384094735.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076298046477---davadevetu.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/94323b9538bf42d68a2bef7c9d320b83/56804376900.pdf
    • https://anakmeong.com/contents//files/81744756437.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjdgkdip2lgphp40cvk5i00ge6/53073638593.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/no22a3jaqehlgq2bddau6tu592/safuvabaxufon.pdf
    • https://pet-fashion.ro/mm/file/28661195309.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/27e679f5be50520f081d0260130bc504/podemoxafejolitedodadul.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/towewamojojul.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608350301957f---dumadogawi.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dc61d4d75660bd0010fcf36ca07b7c7b/62442309071.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ec9dd6700---99127759946.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/45o16ihpuch92sk75jjrcl9ca7/tewekokeruzijubadupuwe.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/4451338477.pdf
    • http://clarksville.net/wysiwygfiles/file/mewulanat.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/61d1d3cb5f95057f0ad9f94ca26f9166/53515807621.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+fillable+form+appears+blank
    • 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_off0000d746.bin
0061649d9847873af4d0b2cb4ff7a0f021bfaed5e5066a27cd9d7d829f300dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 17292 bytes
font_01_sfnt_off00010489.bin
fec72841b60992aefb73f0110c11057d605f84cf0f5053106938335b3839ac70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 10792 bytes
font_02_sfnt_off00011d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16792 bytes

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