Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b965003b01ae876…

MALICIOUS

PDF

155.3 KB Created: 2021-06-22 09:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5845a2dd518ea08d3c99992cbf45ebcf SHA-1: 73e442a9420e42110358d7deb8101ca8df10e428 SHA-256: 9b965003b01ae8765e61387d327727446e187d2aad4aa0a948b4ef1d0c5dc487
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised CMS upload storage further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089a844b6417---fevejusorutiravu.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608accbe4187b---44353817018.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4835e5ce---14419389166.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3904f61a81---mesoxozisotemu.pdf
    • https://ckmusicdesign.nl/userfiles/file/85620869769.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59bbea755---vewuxar.pdf
    • http://younewstoday.com/task/userimages/file/18378747312.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f5639aab1a87bad8d0e0853af999e8b9/tikuminuwonu.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca415f29f4---84872859148.pdf
    • http://strahovka66.ru/userfiles/file/pusenabugenakewotonini.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/89301177613.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a02c9befe93535942e90909aa146034e/29444215463.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608750cad67f5---26140914444.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/956d1b256b3de9f7fe52bed159580428/labasiv.pdf
    • http://www.cbs-emballages.com/upload/file/92138849627.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/vjiahr2et3bvdeleap6mau34j2/saponidasuzavofojozopug.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ca7d3c621dbac19fcfafe03e77295288/liwaxugurezun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=great+expectations+free+pdf
    • 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
    • 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_off00020d73.bin
6f8e1584c04322b914727771f475bed10e61fe3109111249e565783ede2364a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x20D73 5216 bytes
font_01_sfnt_off00021f47.bin
1ee707e0b861ce016947c5e8559c25c24133593938c74d4993207930da633520
pdf-font-stream PDF embedded font (sfnt) at offset 0x21F47 12904 bytes
font_02_sfnt_off00024a64.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x24A64 16204 bytes