Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c52dec49abd9b87…

MALICIOUS

PDF

85.1 KB Created: 2021-07-16 03:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4e1347c096b849b0a58885817a01c21 SHA-1: 0d8753629b21117f3d6e44548dc86ec09a9d23cf SHA-256: 0c52dec49abd9b871dbade3e2a33fc88dd1b9d04ccee557a87162dac93ce5b81
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm hosted on potentially compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d7cee21fa---lejiro.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d5c03bb56296cb8e9f6a7b9d71a0a9c2/widudisawur.pdf
    • http://pallenberg-busreisen.de/uploads/files/xutiruf.pdf
    • http://busankid.com/webfiles/board/file///bexev.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f6c2322f6cc162620630579bf1debaa1/falevodexufi.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/6544617793.pdf
    • http://dafangtour.com/fckeditor/userimages/file/gutun.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a8a313bad42027cd12f6f955aed93d48/70917617486.pdf
    • http://jnafarms.com/clients/864068/File/vasel.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983b7a1b4d6---zusetawi.pdf
    • http://teplospectr.ru/images/files/33089898581.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793402da7fa---sitivudutod.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90af448ee---10573512411.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/43n8cr1mmqq0i8al9nife4sjp3/88527703235.pdf
    • http://alfavit.tv/userfiles/file/62640393547.pdf
    • http://sakem.org/userfiles/files/tinitamawemuxojaki.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a85fa885e39---nokeborusixifukirege.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6268c3d95bdcd8bfe2f7a75d44bdd988/gulovinede.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4a633dcb7569ca24677115ccd38450b6/zomuturejidagejaridufogu.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912e78b6a9---59616836839.pdf
    • http://jnnycc.org/userfiles/file/94230150298.pdf
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1624983232.pdf
    • http://aftckwt.com/uploads/file/jakafixepe.pdf
    • http://technocom.pl/editor/file/relozudugerutelepifabim.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/atoekh1lqs3qgsf7ka8n6elbr4/wefabukodowazo.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc4dc0b3f---51102187571.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=half+life+meaning
    • 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_off0000eed1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16792 bytes
font_01_sfnt_off000106e8.bin
b0a8a3f6435dd667a2b5754caf4b558a456b9026e207d8b3565ee0e97ca522bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10060 bytes
font_02_sfnt_off00011d1e.bin
3170b35c686b9db09049619321fbf24d6ffc6b7b79b9bcd72778a89dc732e916
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16200 bytes