Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f6f27aaaa42611…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 01:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff7ea3eae50eab4a5f47d0ad29ac8bf9 SHA-1: b6ec97c20f76fe21b9708809c34a9e5c700e77ad SHA-256: 46f6f27aaaa42611e7756757f5df80a59eda7bd862e56dc26bed32f6e9d4af67
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains or WordPress upload directories. The embedded URLs suggest a phishing or malware distribution campaign.

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 http://meskerjager.nl/media/files/70814055825.pdf
    • https://webornate.com/viking1/uploads/files/55994607792.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8885c363a4---rikodutonalosonoxu.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f224b9e34ba---94168330592.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a15f7ce9b79---nufoputupebazevafenubi.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc4ba9a300---84329005492.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5e3edb7bed53f86d6f1edd4b09cadc8d/revixotol.pdf
    • https://empresa-venta.hr/files/50735581259.pdf
    • https://floresdeserrezuela.com/aym_image/files/33555632377.pdf
    • http://thienanglass.vn/upload/files/mefafunigimazedulawo.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16103d80f8d37d---86273418899.pdf
    • http://metabolit-plus.ru/files/file/84870323040.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8045a944a632a25940e6ad6f345290d0/zerimesuvefuwinolo.pdf
    • https://smg.bid/ckfinder_userfiles/files/buxivifilurubabitazo.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/govazasazunede.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7faa16497---vulofug.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d1292942---zuwasuzowirosagipeve.pdf
    • http://ingmontagna.com/userfiles/files/gusibowotulakewodifex.pdf
    • http://vnndt.com/Images_upload/files/69412760304.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/38749968248.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-6/20210506232611963286.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbc512390---kuxezapirurip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=personal+statement+for+college+examples+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_off0000c1ff.bin
f9adde760a88f994eff8ecbb9e4522ea572abfeb45ec4dd5cf944bdff36fba57
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 10976 bytes
font_01_sfnt_off0000db59.bin
9ed7ef688fdc32fcdcae4fd30af88b708a61346127093496f6d918a933c0dfb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16992 bytes
font_02_sfnt_off00010774.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16792 bytes