Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c38996f8e2e35e1…

MALICIOUS

PDF

74.4 KB Created: 2021-08-28 02:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ad9507b36ca15be3c8bbfb120660d08 SHA-1: 5369bae78fec130a99591c6ce394a7b01fb33887 SHA-256: 7c38996f8e2e35e16af1b4bca53b564b6b4784f4724247520efc1e1104c39f7d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS upload storage. This suggests the primary intent is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606f0ea540fde---wiburekuxojurikefo.pdf
    • https://aawyx.com/sites/default/imageuser/file/55233099612.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/561975d8f69abe3d8105edc82d42fd9a/97246466173.pdf
    • http://x04ydivan.ru/userfiles/file/11858030513.pdf
    • http://yuhenganquan.com/userfiles/file/20210828072052_1146845632.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4617bb6f---jefepemejewozodidaviruvo.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/86da25af85e2610bb83376bcad888423/jurezibugagumaroseg.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4428e5721---69008320582.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/25872387068.pdf
    • http://kursadowicz.pl/Upload/file/dajaxatijagikebovapexapa.pdf
    • http://youngshiny.com/userfiles/file/1624630088.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ee39d0ff74d610bef2fd4a616c50a996/suwaduxilitavogepurero.pdf
    • http://salt17.com/userfiles/files/pabaditemojura.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2874678b5---83249500125.pdf
    • http://kapsalonvogue.nl/files/file/1017425272.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/16c682cedd948f7c289c4b1d44a3ab5b/gepitipo.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/fipivuvegejobadoketol.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c695944626d---3381977502.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325252f695---90260891344.pdf
    • https://baptistfriends.org/media/31224681083.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1r14t2aou14s42jtre56d2as1/28936119783.pdf
    • http://jsdarvin.com/files/vodinexatugusowogi.pdf
    • http://controldellaves.com/app/webroot/arxius/file/tuzojugugopowawuwumune.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d4c61f69f---94869235192.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbe8d8b451---12813627993.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+new+thar+2020+price
    • 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_off0000c16a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC16A 16792 bytes
font_01_sfnt_off0000d981.bin
468d93b9d259451f0969b5e86df6b545ebc804f24ee003b54fb6df775d0a667f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 10492 bytes
font_02_sfnt_off0000f16f.bin
35f2b602857b9a708922eda86a6161c24078cec314ed3200f3b78dada7de469f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 16536 bytes