Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd862b392024738…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 08:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23e55490ec2490d92bda34fab93d4b56 SHA-1: 5b4ad56da5e3f0731bd4828b4732b46e64d658c6 SHA-256: 2bd862b392024738fd7798d8bbb05d43d835dfe8ee79dc0465b4ce2540946539
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The PDF structure and embedded links suggest it is likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://billedbutikken.dk/articlefiles/file/dipojakakelesimuvefun.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96da553231---jiwufetuk.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/63446620295.pdf
    • https://nhachoxebus.com/upload/fck/file/galeroxuwesimevepovuxi.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b51495a38---vovowafafunafezodufajoto.pdf
    • http://e-district.org/userfiles/file/38095498137.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/u10t8bmqc9ngevee30qo5k42hq/madotolaxug.pdf
    • http://hoteldazegliotorino.com/userfiles/files/nibaritufutosiwijatelum.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e07ea96c876---vuxuzopakot.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc791f3ebdc02e85e7a14752affdfa21/xibejawe.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/romagelozutegijagapig.pdf
    • http://dagmar-e.de/userfiles/file/wupemu.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160729b857fd8d---22816559866.pdf
    • http://primehorseproperty.com/userfiles/files/ketiruripejazo.pdf
    • https://amzentransportationindustries.com/admin/imagetemp1/file/36356252556.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acdc4a021---jaxapagalolinawemos.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210814_070807.pdf
    • http://homeshopeez.com/uploaded_files/userfiles/files/81425257153.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7a66b2d3b5ad4cdd125b4dc9888c5d20/30533658932.pdf
    • http://pazarziraat.com/userfiles/file/welud.pdf
    • http://snsi.jp/image/news_file/meruguneluwelifano.pdf
    • https://anctools.com/ckfinder/userfiles/files/71767842002.pdf
    • http://ecohort.com/userfiles/files/86941452107.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/39602050793.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=maldi+tof+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_off0000c9b6.bin
111dbe24b2bcaefba21f7ebada3ab3714208968c8c5d281377889f05bacf152d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 17952 bytes
font_01_sfnt_off0000f83f.bin
21087b3a3bab9083417c816b8bc7a26ea928555a204f616cd5fc0754abbfe284
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 9980 bytes
font_02_sfnt_off00010e64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 16792 bytes