Malicious PDF — malware analysis report

Static analysis result for SHA-256 432c45e8c55b9e46…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 00:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db40b5ca7aeadad6f3e11e7d550d3c69 SHA-1: 6cd50dbf89e7246283a9a62a75de3caafc9792ed SHA-256: 432c45e8c55b9e4612a718e59e5af99cab5bcc0b03e6af176107114501401364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other domains, likely to lure users into phishing sites or download further malware. The presence of external URIs and link farm characteristics strongly suggests a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=aplikasi+foto+editor+terbaik+android
    • https://autoroman-service.ro/imagini_ws/83497289203.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/02jghmo0iodtaipn2reio805j8/71784111810.pdf
    • http://hicoweld.com/shop/fck_file/file/55294858094.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2c5fa28e088cb8d2eca334a251683481/66580399356.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/25277fc0fa7eab13f865388b5eb4006c/bokazinepelunuzugujago.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89605327618.pdf
    • http://geologocarmignani.com/userfiles/files/puweforogapefejitibot.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406504665c6---musabifadumepuronoj.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/85128844734.pdf
    • https://hotelite.in/userfiles/file/wegamijonam.pdf
    • http://dsraxys.com/uploads/walubifeje.pdf
    • http://skrutit-probeg.ru/upload_picture/file/28210171699.pdf
    • http://getvisa.ru/images/File/jezebimulu.pdf
    • https://ppntassone.it/dati/upload/file/jikijimodozeri.pdf
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/97550435090.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/19811b10c1faa2dbd8b9e01d4fe4f7fb/kixaliwugufotajak.pdf
    • https://futurefacesnyc.com/uploads/file/43243020941.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/vegagogade.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/7416692240.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c1b9199a---22016139898.pdf
    • http://cokhitienvuong.com/uploads/files/62921507705.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/lajoxesilivawew.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://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_off0000f050.bin
cec591f858b8e6efb9f187752d2288b77421b68afe926de8023b63f2de9a9a18
pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10704 bytes
font_01_sfnt_off000108cc.bin
875546c2ad4b91e93da25488b2af02203030ad38937a94c700149a1c856a73db
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 17016 bytes
font_02_sfnt_off00013527.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 16792 bytes