Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca26840a993eeb9a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 06:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d411b96fc9375dd458d6f0031401f51c SHA-1: ec42137cf1cf7fb73068c769efb7d7c9d8743308 SHA-256: ca26840a993eeb9a6151d3a966cb12855cafed3a4aeed63c91e580694aebd8a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://parklanehotel.asia/userfiles/file/dukuliv.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80e238e41---wekizajadobukodupebexezu.pdf
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tobakubivilawidupu.pdf
    • http://chi-kara.net/userfiles/file/berezadorotexudekegugap.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074881246e6e---tixerito.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/13cmq0q5nlem4mdthhm5k4m3i1/21245640031.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3vvf9hmbadfidcl8isgtsspk9h/5385592269.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f3bc671d25918211e1988639f920fcdc/6444073566.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ac38f413a765db8367dfb25f07ae9bbb/98289857634.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078e62bdff4a---8915262300.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/zenufeb.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/67c19a128bbb01bf724fb221cb1f2d20/912372128.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a43977c60b6---baxevodemenifokujugozix.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6ad87bb08e369b95d3efca354b9d5df4/mafidozuso.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b284966e14c---87634313735.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aefba38a9---79096668220.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a77041815---xejujavuji.pdf
    • http://amdind.com/userfiles/file/mejitobixarofusidogukejik.pdf
    • http://buergerforum-tirol.at/file/wejusuwanitojazebapunil.pdf
    • https://pasarantogel.com/contents//files/72937950708.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/739bf1cf6fade1ec248956ceb32cf8fd/xesomubokifupasevonaxo.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/770c35d6c980e0789e6dc7d09f904a8f/93004431751.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=stone+cliff+campground
    • 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_off0000ea65.bin
cb67584cb85b7957694ff0ee7e4645fc0948fd8b424c49ccbecc1a5618f0f288
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 10972 bytes
font_01_sfnt_off0001039d.bin
20c1c764bff9ee6afb6d213570264b4f2febc5b6ca8abbd97c2bd26c6d2bfe2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 17680 bytes
font_02_sfnt_off000131e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 16792 bytes