Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b18491924dbb8c2…

MALICIOUS

PDF

93.6 KB Created: 2021-06-28 21:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a614b171fceda7fbdc5cccdc8469fd0f SHA-1: fd32ff270be54bcf07192dce6c1429451b43b4e4 SHA-256: 8b18491924dbb8c2ee181ba069bb474f546a5d33bce09f3b0220e3d0198c111b
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view its content. This is a common tactic to facilitate malware installation or credential theft. The document also contains numerous links to potentially compromised websites, suggesting a link farm or distribution network. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://espaciocultivarte.com/ckfinder/userfiles/files/nedupironipeked.pdf In PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/lilomomavix.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e142187698985002eac4f86afd6b705/kobulokisugemizov.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732e4150f30---mofimojomozike.pdfIn PDF document text
    • http://mp-journal.com/media/file/40892975185.pdfIn PDF document text
    • http://strap.sk/uploads/files/32376843813.pdfIn PDF document text
    • http://nfc.soo.jp/file/4324227678.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/545f02b4a839a34018cb43b27b03d2a4/43986195075.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c82b7798b9---poxumuwape.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acecf36bfe7---fodojaxuk.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074a679cb548---34576150529.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/f6376be34dd9d0236a2930b105255112/kemuxobi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/patalasegusagojefaxadeniw.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/xelevawisagijo.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/tunadena.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/457ab0c37f0787082c30121c2f39642c/luzokuzujigigifopim.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fb77f290---zewamipumalisuxeju.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/7378557654.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0kekvughmltdg32ot3alidcdqk/17329376149.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ni77nni63qh09os418oor3o8oj/kezibikibonizakobota.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/21324351250.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb857c01d0---34773596429.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210525125735_122898142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=computer+related+quiz+questions+with+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 17856 bytes
SHA-256: 684503036b267968bd6fd818e585adf53b5c463f1d16da07be47d640e906dddb
font_01_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 16064 bytes
SHA-256: 6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
font_03_sfnt_off00014d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5B 11080 bytes
SHA-256: 466691464b8b861d48601d1bfa783d29c11c599103ac915e416680ec6650a612

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