Malicious PDF — malware analysis report

Static analysis result for SHA-256 38659cdd0a81efe8…

MALICIOUS

PDF

73.4 KB Created: 2021-08-28 09:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5df3bbb6c3c058649d16e74e6b7eba35 SHA-1: 4bbc0a86ad68ad350d1c9814245a0d24e29a16fc SHA-256: 38659cdd0a81efe85b31221e13d2e728febb3d04813f954809b15122717e0287
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608add64320ec---jovovamomuw.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tfkille3qka9o1ja4svo79j06c/65353457102.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de61ae40580---43082744527.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/mivanofaxamisapuwukebin.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kc34f5jht8n3gl0v0u68as7gud/21194233481.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/13542808888.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/h7f7agaa65l0g45mljc2ahcs4u/69483639176.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1018d5d2---rikimeruxazamegozuloz.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c0f2a44c---buvusi.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bd49ad8160a2d6d15512e9868f4d8f24/vozeb.pdf
    • http://abwplazaview.com/uploads/files/kudojefafomunilikabad.pdf
    • http://raylutickenterprises.com/userfiles/files/sonawenusuwonudivavi.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/70a8e1814b692734140e1fa6ef7c9f0a/10772968001.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/q0pqu99v9vimai0kbuofol5ond/pesajamugewogivojixave.pdf
    • http://vodnik48.ru/content/file/pagutaretozo.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7ba5bb1f61dede71be12df87e953e4f2/44533378067.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4878dfab1c6c2e54b67da051ab7e181e/32692174691.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/61104115555e121aa92cd04a7d0d0157/42541885756.pdf
    • http://maihome.hu/admin1/file/lazipa.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2i993q0nnt6mf8a2kc3mu5oo40/72702857145.pdf
    • https://tempatpasang.com/contents/files/55167339454.pdf
    • http://kingkady.cn/uploadfile/files/jinak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=phrasal+meaning+in+english
    • 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_off0000be54.bin
863cb35c6b0bcce1796f1705f775eb5747c079edb5f33305e94c242bcaf50680
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE54 16460 bytes
font_01_sfnt_off0000e8f8.bin
ff68cd38989dd3341a7686e493e0efcd5addcfda22fec8c5a15592919886a1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10336 bytes
font_02_sfnt_off00010003.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes